| General information |
| Product type designation | CPU 1518T-4 PN/DP |
| HW functional status | FS11 |
| Firmware version | V3.1 |
| ● FW update possible | Yes |
| Product function |
| ● I&M data | Yes; I&M0 to I&M3 |
| ● Isochronous mode | Yes; Distributed and central; with minimum OB 6x cycle of 125 µs (distributed) and 1 ms (central) |
| ● SysLog | Yes |
| Engineering with |
| ● STEP 7 TIA Portal configurable/integrated from version | V19 (FW V3.1) / V17 (FW V2.9) or higher |
| Configuration control |
| via dataset | Yes |
| Display |
| Screen diagonal [cm] | 6.1 cm |
| Control elements |
| Number of keys | 6 |
| Mode selector switch | 1 |
| Supply voltage |
| Rated value (DC) | 24 V |
| permissible range, lower limit (DC) | 19.2 V |
| permissible range, upper limit (DC) | 28.8 V |
| Reverse polarity protection | Yes |
| Mains buffering |
| ● Mains/voltage failure stored energy time | 5 ms |
| ● Repeat rate, min. | 1/s |
| Input current |
| Current consumption (rated value) | 1.55 A |
| Current consumption, max. | 1.9 A |
| Inrush current, max. | 1.9 A; Rated value |
| I²t | 0.4 A²·s |
| Power |
| Infeed power to the backplane bus | 12 W |
| Power consumption from the backplane bus (balanced) | 30 W |
| Power loss |
| Power loss, typ. | 24 W |
| Memory |
| Number of slots for SIMATIC memory card | 1 |
| SIMATIC memory card required | Yes |
| Work memory |
| ● integrated (for program) | 9 Mbyte |
| ● integrated (for data) | 60 Mbyte |
| Load memory |
| ● Plug-in (SIMATIC Memory Card), max. | 32 Gbyte |
| Backup |
| ● maintenance-free | Yes |
| CPU processing times |
| for bit operations, typ. | 1 ns |
| for word operations, typ. | 2 ns |
| for fixed point arithmetic, typ. | 2 ns |
| for floating point arithmetic, typ. | 6 ns |
| CPU-blocks |
| Number of elements (total) | 20 000; Blocks (OB, FB, FC, DB) and UDTs |
| DB |
| ● Number range | 1 ... 60 999; subdivided into: number range that can be used by the user: 1 ... 59 999, and number range of DBs created via SFC 86: 60 000 ... 60 999 |
| ● Size, max. | 16 Mbyte; For DBs with absolute addressing, the max. size is 64 KB |
| FB |
| ● Number range | 0 ... 65 535 |
| ● Size, max. | 1 Mbyte |
| FC |
| ● Number range | 0 ... 65 535 |
| ● Size, max. | 1 Mbyte |
| OB |
| ● Size, max. | 1 Mbyte |
| ● Number of free cycle OBs | 100 |
| ● Number of time alarm OBs | 20 |
| ● Number of delay alarm OBs | 20 |
| ● Number of cyclic interrupt OBs | 20; with minimum OB 3x cycle of 100 µs |
| ● Number of process alarm OBs | 50 |
| ● Number of DPV1 alarm OBs | 3 |
| ● Number of isochronous mode OBs | 3 |
| ● Number of technology synchronous alarm OBs | 2 |
| ● Number of startup OBs | 100 |
| ● Number of asynchronous error OBs | 4 |
| ● Number of synchronous error OBs | 2 |
| ● Number of diagnostic alarm OBs | 1 |
| Nesting depth |
| ● per priority class | 24 |
| Counters, timers and their retentivity |
| S7 counter |
| ● Number | 2 048 |
| Retentivity |
| — adjustable | Yes |
| IEC counter |
| ● Number | Any (only limited by the main memory) |
| Retentivity |
| — adjustable | Yes |
| S7 times |
| ● Number | 2 048 |
| Retentivity |
| — adjustable | Yes |
| IEC timer |
| ● Number | Any (only limited by the main memory) |
| Retentivity |
| — adjustable | Yes |
| Data areas and their retentivity |
| Retentive data area (incl. timers, counters, flags), max. | 768 kbyte; In total; available retentive memory for bit memories, timers, counters, DBs, and technology data (axes): 700 KB |
| Extended retentive data area (incl. timers, counters, flags), max. | 20 Mbyte; When using PS 6 0W 24/48/60 V DC HF |
| Flag |
| ● Size, max. | 16 kbyte |
| ● Number of clock memories | 8; 8 clock memory bit, grouped into one clock memory byte |
| Data blocks |
| ● Retentivity adjustable | Yes |
| ● Retentivity preset | No |
| Local data |
| ● per priority class, max. | 64 kbyte; max. 16 KB per block |
| Address area |
| Number of IO modules | 16 384; max. number of modules / submodules |
| I/O address area |
| ● Inputs | 32 kbyte; All inputs are in the process image |
| ● Outputs | 32 kbyte; All outputs are in the process image |
| per integrated IO subsystem |
| — Inputs (volume) | 32 kbyte; max. 32 KB via X1; max. 8 KB via X2 or X4 |
| — Outputs (volume) | 32 kbyte; max. 32 KB via X1; max. 8 KB via X2 or X4 |
| per CM/CP |
| — Inputs (volume) | 8 kbyte |
| — Outputs (volume) | 8 kbyte |
| Subprocess images |
| ● Number of subprocess images, max. | 32 |
| Hardware configuration |
| Number of distributed IO systems | 64; A distributed I/O system is characterized not only by the integration of distributed I/O via PROFINET or PROFIBUS communication modules, but also by the connection of I/O via AS-i master modules or links (e.g. IE/PB-Link) |
| Number of DP masters |
| ● integrated | 1 |
| ● Via CM | 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total |
| Number of IO Controllers |
| ● integrated | 2 |
| ● Via CM | 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total |
| Rack |
| ● Modules per rack, max. | 32; CPU + 31 modules |
| ● Number of lines, max. | 1 |
| PtP CM |
| ● Number of PtP CMs | the number of connectable PtP CMs is only limited by the number of available slots |
| Time of day |
| Clock |
| ● Type | Hardware clock |
| ● Backup time | 6 wk; At 40 °C ambient temperature, typically |
| ● Deviation per day, max. | 10 s; Typ.: 2 s |
| Operating hours counter |
| ● Number | 16 |
