| ***Spare part*** SIMATIC S7-300, CPU 314 Central processing unit with Integr. power supply 24 V DC Work memory 24 KB |
| Supply voltage |
| Rated value (DC) | 24 V |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Input current |
| Current consumption (rated value) | 1 000 mA |
| Inrush current, typ. | 8 A |
| Power loss |
| Power loss, typ. | 8 W |
| Memory |
| Work memory |
| integrated | 24 kbyte; 24 KB/8 K instructions RAM (integrated); 1 instruction means 3 bytes on average |
| Load memory |
| expandable FEPROM | Yes; Flash-EPROM |
| expandable FEPROM, max. | 4 Mbyte |
| integrated RAM, max. | 40 kbyte |
| Backup |
| present | Yes |
| with battery | Yes; all blocks |
| without battery | Yes; 4 KB: bit memory, counter, times and data |
| CPU processing times |
| for bit operations, typ. | 0.3 µs |
| for bit operations, max. | 0.6 µs |
| for word operations, typ. | 1 µs |
| for fixed point arithmetic, typ. | 2 µs |
| for floating point arithmetic, typ. | 50 µs |
| for timer/counter operations, typ. | 12 µs |
| CPU-blocks |
| DB |
| Number, max. | 127 |
| Size, max. | 8 kbyte |
| FB |
| Number, max. | 128 |
| Size, max. | 8 kbyte |
| FC |
| Number, max. | 128 |
| Size, max. | 8 kbyte |
| OB |
| Description | see instruction list |
| Size, max. | 8 kbyte |
| Number of free cycle OBs | 1; OB 1 |
| Number of time alarm OBs | 1; OB 10 |
| Number of cyclic interrupt OBs | 1; OB 35 |
| Number of process alarm OBs | 1; OB 40 |
| Number of startup OBs | 1; OB 100 |
| Nesting depth |
| per priority class | 8 |
| Counters, timers and their retentivity |
| S7 counter |
| Number | 64 |
| Retentivity |
| — adjustable | Yes |
| — lower limit | 0 |
| — upper limit | 63 |
| Counting range |
| — lower limit | 1 |
| — upper limit | 999 |
| S7 times |
| Number | 128 |
| Retentivity |
| — adjustable | Yes |
| — lower limit | 0 |
| — upper limit | 127 |
| Time range |
| — lower limit | 10 ms |
| — upper limit | 9 990 s |
| Data areas and their retentivity |
| Flag |
| Number, max. | 256 byte |
| Retentivity available | Yes; MB 0 to MB 255 |
| of which retentive with battery | 0 to 2 047 (M 0.0 to M 255.7, adjustable) |
| of which retentive without battery | 0 to 2 047 (M 0.0 to M 255.7, adjustable) |
| Address area |
| I/O address area |
| Inputs | 512 byte |
| Outputs | 512 byte |
| Process image |
| Inputs | 128 byte |
| Outputs | 128 byte |
| Digital channels |
| Inputs | 1 024 |
| Outputs | 1 024 |
| Analog channels |
| Inputs | 256 |
| Outputs | 128 |
| Addressing volume |
| Inputs | 122 byte |
| Outputs | 122 byte |
| Hardware configuration |
| Number of expansion units, max. | 3 |
| connectable programming devices/PCs | PGs/PCs with STEP 7 connectable via MPI interface |
| Number of modules per DP slave interface, max. | 16 |
| Number of DP masters |
| integrated | 0 |
| via CP | 1; CP 342-5 |
| Number of operable FMs and CPs (recommended) |
| FM | 4 |
| CP, PtP | 2 |
| CP, LAN | 1 |
| Rack |
| Modules per rack, max. | 32 |
| Time of day |
| Clock |
| Hardware clock (real-time) | Yes |
| Interfaces |
| MPI |
| Cable length, max. | 9 100 m; without repeaters: 50 m; with 2 repeaters: 1100 m; with 10 repeaters in series: 9100 m; via fiber optic cable: 23.8 km (with 16 star hubs or OLMs) |
| 1. Interface |
| Protocols |
| MPI | Yes |
| MPI |
| Number of nodes, max. | 32; 32 nodes on MPI bus; PG/PC, OP, additional S7-300/400, C7; per CPU max. 4 static and 4 dynamic connections |
| Transmission rate, max. | 187.5 kbit/s |
| Services |
| — PG/OP communication | Yes |
| — Global data communication | Yes |
| — S7 basic communication | Yes |
| — S7 communication | Yes |
| Communication functions |
| PG/OP communication | Yes |
| Global data communication |
| supported | Yes |
| S7 basic communication |
| supported | Yes |
| S7 communication |
| supported | Yes |
| as server | Yes |
| S5 compatible communication |
| supported | Yes; via loadable blocks |
| Standard communication (FMS) |
| supported | Yes; via loadable blocks |
| Number of connections |
| overall | |
| — of which dynamic | 8 |
| — of which static | 4 |
| Configuration |
| Configuration software |
| STEP 7 | Yes; V5.0, V5.0 SP1 |
| Programming |
| Command set | Binary logic operations, bracketed operations, result allocation, saving, counting, loading, transferring, comparing, shifting, rotating, complementation, calling blocks, fixed point arithmetic, floating point arithmetic, jump functions |
| Nesting levels | 8 |
| Program organization | Linear, structured |
| System functions (SFC) | Interrupt and error processing, copy data, clock functions, diagnostic functions, module parameterization, operating mode transitions |
| System function blocks (SFB) | 1 |
| Programming language |
| — LAD | Yes |
| — FBD | Yes |
| — STL | Yes |
| — SCL | Yes |
| — GRAPH | Yes |
| Software libraries |
| — Process diagnostics | Yes |
| — Software controller | Yes; depending on the required memory space and the resulting execution time |
| Know-how protection |
| User program protection/password protection | Yes |
| Cycle time monitoring |
| lower limit | 1 ms |
| upper limit | 6 000 ms |
| adjustable | Yes |
| preset | 150 ms |
| Dimensions |
| Width | 80 mm |
| Height | 125 mm |
| Depth | 130 mm |
| Weights |
| Weight, approx. | 530 g; Memory card 16 g |
| last modified: | 03/13/2019 |
