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SIMATIC S7-300, CPU 312C COMPACT CPU WITH MPI, 10 DI/6 DO, 2 FAST COUNTERS (10 KHZ), INTEGRATED 24V DC POWER SUPPLY, 16 KBYTE WORKING MEMORY, MICRO MEMORY CARD REQUIRED
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Supply voltage
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Rated value (DC)
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24 V
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permissible range, lower limit (DC)
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20.4 V
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permissible range, upper limit (DC)
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28.8 V
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Load voltage L+
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● Rated value (DC)
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24 V
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● permissible range, lower limit (DC)
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20.4 V
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● permissible range, upper limit (DC)
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28.8 V
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Input current
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Current consumption (rated value)
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500 mA
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Inrush current, typ.
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11 A
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Power loss
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Power loss, typ.
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6 W; incl. integrated inputs/outputs
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Memory
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Work memory
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● integrated
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16 kbyte; For program and data
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● expandable
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No
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Load memory
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● expandable FEPROM
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Yes; with Micro Memory Card (MMC)
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● expandable FEPROM, max.
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4 Mbyte
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Backup
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● present
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Yes; Guaranteed by MMC (maintenance-free)
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● without battery
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Yes; Program and data
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CPU processing times
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for bit operations, typ.
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0.2 µs
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for bit operations, max.
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0.4 µs
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for word operations, typ.
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1 µs
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for fixed point arithmetic, typ.
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2 µs
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for floating point arithmetic, typ.
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30 µs
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CPU-blocks
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DB
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● Number, max.
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63; DB 0 reserved
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FB
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● Number, max.
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64
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FC
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● Number, max.
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64
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OB
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● Size, max.
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16 kbyte
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● Number of time alarm OBs
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1
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● Number of delay alarm OBs
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1
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● Number of cyclic interrupt OBs
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1
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● Number of process alarm OBs
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1
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Nesting depth
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● per priority class
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8
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● additional within an error OB
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4
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Counters, timers and their retentivity
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S7 counter
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● Number
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128
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Retentivity
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— adjustable
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Yes
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— lower limit
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0
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— upper limit
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128
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Counting range
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— lower limit
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1
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— upper limit
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999
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IEC counter
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● present
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Yes
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● Type
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SFB
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S7 times
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● Number
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128
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Retentivity
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— adjustable
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Yes
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— lower limit
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0
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— upper limit
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128
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Time range
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— lower limit
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10 ms
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— upper limit
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9 990 s
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IEC timer
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● present
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Yes
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● Type
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SFB
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Data areas and their retentivity
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Flag
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● Number, max.
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128 byte
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● Retentivity preset
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MB 0 to MB 15
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Address area
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I/O address area
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● Inputs
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1 kbyte
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● Outputs
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1 kbyte
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Process image
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● Inputs
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128 byte
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● Outputs
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128 byte
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Digital channels
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● Inputs
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256
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● Outputs
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256
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Analog channels
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● Inputs
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64
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● Outputs
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32
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Hardware configuration
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Number of expansion units, max.
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0
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Number of DP masters
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● via CP
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1
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Number of operable FMs and CPs (recommended)
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● FM
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4
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● CP, PtP
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2
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● CP, LAN
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1
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Rack
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● Racks, max.
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1
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● Modules per rack, max.
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8
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Time of day
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Clock
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● Software clock
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Yes
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● retentive and synchronizable
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No
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Operating hours counter
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● Number
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1
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Clock synchronization
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● supported
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Yes
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Digital inputs
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Number of digital inputs
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10
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Input voltage
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● Rated value (DC)
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24 V
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● for signal "0"
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-3 to +5V
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● for signal "1"
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+15 to +30 V
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Input current
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● for signal "1", typ.
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8 mA
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Input delay (for rated value of input voltage)
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for standard inputs
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— parameterizable
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Yes
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— at "0" to "1", max.
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100 µs; 0.1 / 0.3 / 3 / 15 ms
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For technological functions
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— at "0" to "1", max.
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50 µs
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Cable length
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● shielded, max.
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1 000 m; 100 m for technological functions
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● unshielded, max.
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600 m
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Digital outputs
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Number of digital outputs
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6
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Short-circuit protection
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Yes; Clocked electronically
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Limitation of inductive shutdown voltage to
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L+ (-48 V)
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Output voltage
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● for signal "1", min.
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L+ (-0.8 V)
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Output current
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● for signal "1" permissible range for 0 to 60 °C, max.
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500 mA
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● for signal "1" minimum load current
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5 mA
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● for signal "0" residual current, max.
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0.5 mA
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Switching frequency
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● with resistive load, max.
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100 Hz
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● with inductive load, max.
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0.5 Hz
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Total current of the outputs (per group)
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all mounting positions
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— up to 40 °C, max.
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3 000 mA
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— up to 60 °C, max.
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1 500 mA
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Cable length
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● shielded, max.
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1 000 m
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● unshielded, max.
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600 m
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Encoder
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Connectable encoders
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● 2-wire sensor
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Yes
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— permissible quiescent current (2-wire sensor), max.
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1.5 mA
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Interfaces
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MPI
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● Cable length, max.
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50 m; without repeater
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1. Interface
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Protocols
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● MPI
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Yes
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● PROFIBUS DP master
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No
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● PROFIBUS DP slave
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No
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● Point-to-point connection
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No
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MPI
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● Number of connections
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6
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● Transmission rate, max.
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187.5 kbit/s
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Services
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— PG/OP communication
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Yes
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— Global data communication
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Yes
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— S7 basic communication
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Yes
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— S7 communication
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Yes
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— S7 communication, as client
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No
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— S7 communication, as server
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Yes
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Communication functions
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PG/OP communication
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Yes
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Global data communication
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● supported
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Yes
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● Number of GD packets, transmitter, max.
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4
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● Number of GD packets, receiver, max.
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4
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● Size of GD packets, max.
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22 byte
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S7 basic communication
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● supported
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Yes
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● User data per job, max.
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76 byte
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S7 communication
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● supported
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Yes
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● as server
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Yes
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● as client
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No
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● User data per job, max.
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64 kbyte
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Number of connections
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● overall
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6
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● usable for PG communication
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— reserved for PG communication
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1
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— adjustable for PG communication, max.
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5
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● usable for OP communication
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— reserved for OP communication
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1
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— adjustable for OP communication, max.
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5
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● usable for S7 basic communication
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— reserved for S7 basic communication
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2
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— adjustable for S7 basic communication, max.
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2
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S7 message functions
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Number of login stations for message functions, max.
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3
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Integrated Functions
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Number of counters
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2
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Counting frequency (counter) max.
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10 kHz
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Frequency measurement
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Yes
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Number of pulse outputs
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2
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Limit frequency (pulse)
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2.5 kHz
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Potential separation
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Potential separation digital inputs
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● Potential separation digital inputs
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Yes
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● between the channels, in groups of
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10
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● between the channels and backplane bus
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Yes
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Potential separation digital outputs
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● Potential separation digital outputs
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Yes
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● between the channels, in groups of
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6
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● between the channels and backplane bus
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Yes
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Configuration
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Configuration software
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● STEP 7
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Yes; V5.1 SP2
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Programming
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● Nesting levels
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8
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Programming language
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— LAD
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Yes
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— FBD
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Yes
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— STL
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Yes
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— SCL
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Yes
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— GRAPH
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Yes
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— HiGraph®
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Yes
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Know-how protection
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● User program protection/password protection
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Yes
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Dimensions
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Width
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80 mm
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Height
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125 mm
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Depth
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130 mm
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Weights
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Weight, approx.
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410 g
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last modified:
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04/07/2020
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