| ***Spare part*** SIMATIC S7-300, CPU 312C Compact CPU with MPI, 10 DI/6 DQ, 2 high-speed counters (10 kHz) Integr. power supply 24 V DC, Work memory 32 KB, Front connector (1x 40-pole) and Micro Memory Card required |
| General information |
| HW functional status | 01 |
| Firmware version | V2.6 |
| Engineering with |
| Programming package | STEP 7 V5.3 SP2 or higher with HW update |
| Supply voltage |
| Rated value (DC) | |
| 24 V DC | Yes |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| external protection for power supply lines (recommendation) | Miniature circuit breaker, type C; min. 2 A; miniature circuit breaker type B, min. 4 A |
| Load voltage L+ |
| Rated value (DC) | 24 V |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Digital inputs |
| — Rated value (DC) | 24 V |
| — Reverse polarity protection | Yes |
| Digital outputs |
| — Rated value (DC) | 24 V |
| — Reverse polarity protection | No |
| Input current |
| Current consumption (rated value) | 500 mA |
| Current consumption (in no-load operation), typ. | 60 mA |
| Inrush current, typ. | 11 A |
| I²t | 0.7 A²·s |
| Digital outputs |
| from load voltage L+, max. | 50 mA |
| Power loss |
| Power loss, typ. | 6 W |
| Memory |
| Work memory |
| integrated | 32 kbyte |
| expandable | No |
| Load memory |
| Plug-in (MMC) | Yes |
| Plug-in (MMC), max. | 4 Mbyte |
| Data management on MMC (after last programming), min. | 10 y |
| Backup |
| present | Yes; Guaranteed by MMC (maintenance-free) |
| without battery | Yes; Program and data |
| CPU processing times |
| for bit operations, typ. | 0.2 µs |
| for bit operations, max. | 0.4 µs |
| for word operations, typ. | 0.4 µs |
| for fixed point arithmetic, typ. | 5 µs |
| for floating point arithmetic, typ. | 6 µs |
| CPU-blocks |
| Number of blocks (total) | 1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used. |
| DB |
| Number, max. | 511; Number range: 1 to 511 |
| Size, max. | 16 kbyte |
| FB |
| Number, max. | 1 024; Number range: 0 to 2047 |
| Size, max. | 16 kbyte |
| FC |
| Number, max. | 1 024; Number range: 0 to 2047 |
| Size, max. | 16 kbyte |
| OB |
| Number, max. | see instruction list |
| Size, max. | 16 kbyte |
| Number of free cycle OBs | 1; OB 1 |
| Number of time alarm OBs | 1; OB 10 |
| Number of delay alarm OBs | 1; OB 20 |
| Number of cyclic interrupt OBs | 1; OB 35 |
| Number of process alarm OBs | 1; OB 40 |
| Number of startup OBs | 1; OB 100 |
| Number of asynchronous error OBs | 4; OB 80, 82, 85, 87 |
| Number of synchronous error OBs | 2; OB 121, 122 |
| Nesting depth |
| per priority class | 8 |
| additional within an error OB | 4 |
| Counters, timers and their retentivity |
| S7 counter |
| Number | 128 |
| Retentivity |
| — adjustable | Yes |
| — lower limit | 0 |
| — upper limit | 127 |
| — preset | 8 |
| Counting range |
| — lower limit | 0 |
| — upper limit | 999 |
| IEC counter |
| present | Yes |
| Type | SFB |
| Number | Unlimited (limited only by RAM capacity) |
| S7 times |
| Number | 128 |
| Retentivity |
| — adjustable | Yes |
| — lower limit | 0 |
| — upper limit | 127 |
| — preset | No retentivity |
| Time range |
| — lower limit | 10 ms |
| — upper limit | 9 990 s |
| IEC timer |
| present | Yes |
| Type | SFB |
| Number | Unlimited (limited only by RAM capacity) |
| Data areas and their retentivity |
| retentive data area in total | all |
| Flag |
| Number, max. | 128 byte |
| Retentivity available | Yes; MB 0 to MB 127 |
| Retentivity preset | MB 0 to MB 15 |
| Number of clock memories | 8; 1 memory byte |
| Data blocks |
| Retentivity adjustable | Yes; via non-retain property on DB |
| Retentivity preset | Yes |
| Local data |
| per priority class, max. | 256 byte |
| Address area |
| I/O address area |
| Inputs | 1 kbyte |
| Outputs | 1 kbyte |
| Process image |
| Inputs | 128 byte |
| Outputs | 128 byte |
| Default addresses of the integrated channels |
| — Digital inputs | 124.0 to 125.1 |
| — Digital outputs | 124.0 to 124.5 |
| Digital channels |
| Inputs | 266 |
| — of which central | 266 |
| Outputs | 262 |
| — of which central | 262 |
| Analog channels |
| Inputs | 64 |
| — of which central | 64 |
| Outputs | 64 |
| — of which central | 64 |
| Hardware configuration |
| Number of expansion units, max. | 0 |
| Number of DP masters |
| integrated | none |
| via CP | 4 |
| Number of operable FMs and CPs (recommended) |
| FM | 8 |
| CP, PtP | 8 |
| CP, LAN | 4 |
| Rack |
| Racks, max. | 1 |
| Modules per rack, max. | 8 |
| Time of day |
| Clock |
| Software clock | Yes |
| retentive and synchronizable | No |
| Deviation per day, max. | 15 s |
| Operating hours counter |
| Number | 1 |
| Number/Number range | 0 |
| Range of values | 0 to 2^31 hours (when using SFC 101) |
| Granularity | 1 h |
| retentive | Yes; Must be restarted at each restart |
| Clock synchronization |
| supported | Yes |
| to MPI, master | Yes |
| to MPI, slave | Yes |
| in AS, master | Yes |
| Digital inputs |
| Number of digital inputs | 10 |
| of which inputs usable for technological functions | 8 |
| integrated channels (DI) | 10 |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Number of simultaneously controllable inputs |
| horizontal installation |
| — up to 40 °C, max. | 10 |
| — up to 60 °C, max. | 5 |
| vertical installation |
| — up to 40 °C, max. | 5 |
| Input voltage |
| Rated value (DC) | 24 V |
| for signal "0" | -3 to +5V |
| for signal "1" | +15 to +30V |
| Input current |
| for signal "1", typ. | 9 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| — parameterizable | Yes; 0.1 / 0.3 / 3 / 15 ms |
| — Rated value | 3 ms |
| for technological functions |
| — at "0" to "1", max. | 48 µs |
| Cable length |
| shielded, max. | 1 000 m; 100 m for technological functions |
| unshielded, max. | 600 m; For technological functions: No |
| for technological functions |
| — shielded, max. | 100 m |
| — unshielded, max. | not allowed |
| Digital outputs |
| Number of digital outputs | 6 |
| of which high-speed outputs | 2 |
| integrated channels (DO) | 6 |
| Short-circuit protection | Yes; Clocked electronically |
| Response threshold, typ. | 1 A |
| Limitation of inductive shutdown voltage to | L+ (-48 V) |
| Controlling a digital input | Yes |
| Switching capacity of the outputs |
| on lamp load, max. | 5 W |
| Load resistance range |
| lower limit | 48 Ω |
| upper limit | 4 kΩ |
| Output voltage |
| for signal "1", min. | L+ (-0.8 V) |
| Output current |
| for signal "1" rated value | 500 mA |
| for signal "1" permissible range, min. | 5 mA |
| for signal "1" permissible range, max. | 0.6 A |
| for signal "1" minimum load current | 5 mA |
| for signal "0" residual current, max. | 0.5 mA |
| Parallel switching of two outputs |
| for uprating | No |
| for redundant control of a load | Yes |
| Switching frequency |
| with resistive load, max. | 100 Hz |
| with inductive load, max. | 0.5 Hz |
| on lamp load, max. | 100 Hz |
| of the pulse outputs, with resistive load, max. | 2.5 kHz |
| Total current of the outputs (per group) |
| horizontal installation |
| — up to 40 °C, max. | 2 A |
| — up to 60 °C, max. | 1.5 A |
| vertical installation |
| — up to 40 °C, max. | 1.5 A |
| Cable length |
| shielded, max. | 1 000 m |
| unshielded, max. | 600 m |
| Analog inputs |
| integrated channels (AI) | none |
| Analog outputs |
| integrated channels (AO) | none |
| Encoder |
| Connectable encoders |
| 2-wire sensor | Yes |
| — permissible quiescent current (2-wire sensor), max. | 1.5 mA |
| Interfaces |
| Number of industrial Ethernet interfaces | 0 |
| Number of PROFINET interfaces | 0 |
| Number of RS 485 interfaces | 1; MPI |
| Number of RS 422 interfaces | 0 |
| MPI |
| Cable length, max. | 50 m; without repeater |
| 1. Interface |
| Interface type | Integrated RS 485 interface |
| Physics | RS 485 |
| Isolated | No |
| Power supply to interface (15 to 30 V DC), max. | 200 mA |
| Protocols |
| MPI | Yes |
| PROFIBUS DP master | No |
| PROFIBUS DP slave | No |
| Point-to-point connection | No |
| MPI |
| Number of connections | 6 |
| Transmission rate, max. | 187.5 kbit/s |
| Services |
| — PG/OP communication | Yes |
| — Routing | No |
| — Global data communication | Yes |
| — S7 basic communication | Yes |
| — S7 communication | Yes |
| — S7 communication, as client | No |
| — S7 communication, as server | Yes |
| Communication functions |
| PG/OP communication | Yes |
| Global data communication |
| supported | Yes |
| Number of GD loops, max. | 4 |
| Number of GD packets, max. | 4 |
| Number of GD packets, transmitter, max. | 4 |
| Number of GD packets, receiver, max. | 4 |
| Size of GD packets, max. | 22 byte |
| Size of GD packet (of which consistent), max. | 22 byte |
| S7 basic communication |
| supported | Yes |
| User data per job, max. | 76 byte |
| User data per job (of which consistent), max. | 76 byte; 76 bytes (with X_SEND or X_RCV); 64 bytes (with X_PUT or X_GET as server) |
| S7 communication |
| supported | Yes |
| as server | Yes |
| as client | Yes; Via CP and loadable FB |
| User data per job, max. | 180 byte; With PUT/GET |
| User data per job (of which consistent), max. | 64 byte |
| S5 compatible communication |
| supported | Yes; via CP and loadable FC |
| Number of connections |
| overall | 6 |
| usable for PG communication | 5 |
| — reserved for PG communication | 1 |
| — adjustable for PG communication, min. | 1 |
| — adjustable for PG communication, max. | 5 |
| usable for OP communication | 5 |
| — reserved for OP communication | 1 |
| — adjustable for OP communication, min. | 1 |
| — adjustable for OP communication, max. | 5 |
| usable for S7 basic communication | 2 |
| — reserved for S7 basic communication | 0 |
| — adjustable for S7 basic communication, min. | 0 |
| — adjustable for S7 basic communication, max. | 2 |
| usable for routing | No |
| S7 message functions |
| Number of login stations for message functions, max. | 6; Depending on the configured connections for PG/OP and S7 basic communication |
| Process diagnostic messages | Yes |
| simultaneously active Alarm-S blocks, max. | 20 |
| Test commissioning functions |
| Status block | Yes |
| Single step | Yes |
| Number of breakpoints | 2 |
| Status/control |
| Status/control variable | Yes |
| Variables | Inputs, outputs, memory bits, DB, times, counters |
| Number of variables, max. | 30 |
| — of which status variables, max. | 30 |
| — of which control variables, max. | 14 |
| Forcing |
| Forcing | Yes |
| Forcing, variables | Inputs, outputs |
| Number of variables, max. | 10 |
| Diagnostic buffer |
| present | Yes |
| Number of entries, max. | 100 |
| Interrupts/diagnostics/status information |
| Diagnostics indication LED |
| Status indicator digital input (green) | Yes |
| Status indicator digital output (green) | Yes |
| Integrated Functions |
| Number of counters | 2; 2 channels (see "Technological Functions" manual) |
| Counting frequency (counter) max. | 10 kHz |
| Frequency measurement | Yes |
| Number of frequency meters | 2; 2 channels up to max. 10 kHz (see "Technological Functions" manual) |
| controlled positioning | No |
| integrated function blocks (closed-loop control) | No |
| PID controller | No |
| Number of pulse outputs | 2; 2 channels pulse width modulation up to 2.5 kHz (see Manual "Technological Functions") |
| Limit frequency (pulse) | 2.5 kHz |
| Potential separation |
| Potential separation digital inputs |
| Potential separation digital inputs | Yes |
| between the channels | No |
| between the channels and backplane bus | Yes |
| Potential separation digital outputs |
| Potential separation digital outputs | Yes |
| between the channels | No |
| between the channels and backplane bus | Yes |
| Permissible potential difference |
| between different circuits | 75 V DC/60 V AC |
| Isolation |
| Isolation tested with | 600 V DC |
| Configuration |
| Configuration software |
| STEP 7 | Yes; V5.3 SP2 with HW update |
| Programming |
| Command set | see instruction list |
| Nesting levels | 8 |
| System functions (SFC) | see instruction list |
| System function blocks (SFB) | see instruction list |
| Programming language |
| — LAD | Yes |
| — FBD | Yes |
| — STL | Yes |
| — SCL | Yes |
| — GRAPH | Yes |
| — HiGraph® | Yes |
| Know-how protection |
| User program protection/password protection | Yes |
| Dimensions |
| Width | 80 mm |
| Height | 125 mm |
| Depth | 130 mm |
| Weights |
| Weight, approx. | 409 g |
| last modified: | 03/13/2019 |
