| Product type designation |
CPU 315-2 PN/DP |
| HW functional status |
01 |
| Firmware version |
V3.2 |
| Product function |
| ● Isochronous mode |
Yes; Via PROFIBUS DP or PROFINET interface |
| Engineering with |
| ● Programming package |
STEP 7 V5.5 or higher |
| Supply voltage |
| Rated value (DC) |
24 V |
| permissible range, lower limit (DC) |
20.4 V |
| permissible range, upper limit (DC) |
28.8 V |
| external protection for power supply lines (recommendation) |
2 A min. |
| Mains buffering |
| ● Mains/voltage failure stored energy time |
5 ms |
| ● Repeat rate, min. |
1 s |
| Input current |
| Current consumption (rated value) |
750 mA |
| Current consumption (in no-load operation), typ. |
150 mA |
| Inrush current, typ. |
4 A |
| I²t |
1 A²·s |
| Power loss |
| Power loss, typ. |
4.65 W |
| Memory |
| Work memory |
| ● integrated |
384 kbyte |
| ● expandable |
No |
| Load memory |
| ● Plug-in (MMC) |
Yes |
| ● Plug-in (MMC), max. |
8 Mbyte |
| ● Data management on MMC (after last programming), min. |
10 a |
| Backup |
| ● present |
Yes; Guaranteed by MMC (maintenance-free) |
| ● without battery |
Yes; Program and data |
| CPU processing times |
| for bit operations, typ. |
0.05 µs |
| for word operations, typ. |
0.09 µs |
| for fixed point arithmetic, typ. |
0.12 µs |
| for floating point arithmetic, typ. |
0.45 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. |
1 024; Number range: 1 to 16000 |
| ● Size, max. |
64 kbyte |
| FB |
| ● Number, max. |
1 024; Number range: 0 to 7999 |
| ● Size, max. |
64 kbyte |
| FC |
| ● Number, max. |
1 024; Number range: 0 to 7999 |
| ● Size, max. |
64 kbyte |
| OB |
| ● Size, max. |
64 kbyte |
| ● Number of free cycle OBs |
1; OB 1 |
| ● Number of time alarm OBs |
1; OB 10 |
| ● Number of delay alarm OBs |
2; OB 20, 21 |
| ● Number of cyclic interrupt OBs |
4; OB 32, 33, 34, 35 |
| ● Number of process alarm OBs |
1; OB 40 |
| ● Number of DPV1 alarm OBs |
3; OB 55, 56, 57 |
| ● Number of isochronous mode OBs |
1; OB 61 |
| ● Number of startup OBs |
1; OB 100 |
| ● Number of asynchronous error OBs |
6; OB 80, 82, 83, 85, 86, 87 (OB83 only for PROFINET IO) |
| ● Number of synchronous error OBs |
2; OB 121, 122 |
| Nesting depth |
| ● per priority class |
16 |
| ● additional within an error OB |
4 |
| Counters, timers and their retentivity |
| S7 counter |
| ● Number |
256 |
| Retentivity |
| — adjustable |
Yes |
| — preset |
Z 0 to Z 7 |
| Counting range |
| — adjustable |
Yes |
| — lower limit |
0 |
| — upper limit |
999 |
| IEC counter |
| ● present |
Yes |
| ● Type |
SFB |
| ● Number |
Unlimited (limited only by RAM capacity) |
| S7 times |
| ● Number |
256 |
| Retentivity |
| — adjustable |
Yes |
| — 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 (incl. timers, counters, flags), max. |
128 kbyte |
| Flag |
| ● Size, max. |
2 048 byte |
| ● Retentivity available |
Yes; MB 0 to MB 2 047 |
| ● 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. |
32 768 byte; Max. 2048 bytes per block |
| Address area |
| I/O address area |
| ● Inputs |
2 048 byte |
| ● Outputs |
2 048 byte |
| of which distributed |
| — Inputs |
2 048 byte |
| — Outputs |
2 048 byte |
| Process image |
| ● Inputs |
2 048 byte |
| ● Outputs |
2 048 byte |
| ● Inputs, adjustable |
2 048 byte |
| ● Outputs, adjustable |
2 048 byte |
| ● Inputs, default |
128 byte |
| ● Outputs, default |
128 byte |
| Subprocess images |
| ● Number of subprocess images, max. |
1; With PROFINET IO, the length of the user data is limited to 1600 bytes |
| Digital channels |
| ● Inputs |
16 384 |
| — of which central |
1 024 |
| ● Outputs |
16 384 |
| — of which central |
1 024 |
| Analog channels |
| ● Inputs |
1 024 |
| — of which central |
256 |
| ● Outputs |
1 024 |
| — of which central |
256 |
| Hardware configuration |
| Number of expansion units, max. |
3 |
| Number of DP masters |
| ● integrated |
1 |
| ● via CP |
4 |
| Number of operable FMs and CPs (recommended) |
| ● FM |
8 |
| ● CP, PtP |
8 |
| ● CP, LAN |
10 |
| Rack |
| ● Racks, max. |
4 |
| ● Modules per rack, max. |
8 |
| Time of day |
| Clock |
| ● Hardware clock (real-time) |
Yes |
| ● retentive and synchronizable |
Yes |
| ● Backup time |
6 wk; At 40 °C ambient temperature |
| ● Deviation per day, max. |
10 s; Typ.: 2 s |
| ● Behavior of the clock following POWER-ON |
Clock continues running after POWER OFF |
| ● Behavior of the clock following expiry of backup period |
the clock continues at the time of day it had when power was switched off |
| 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 |
| ● on MPI, device |
Yes |
| ● to DP, master |
Yes; With DP slave only slave clock |
| ● on DP, device |
Yes |
| ● in AS, master |
Yes |
| ● in AS, device |
Yes |
| ● on Ethernet via NTP |
Yes; As client |
| Digital inputs |
| Number of digital inputs |
0 |
| Digital outputs |
| Number of digital outputs |
0 |
| Analog inputs |
| Number of analog inputs |
0 |
| Interfaces |
| Number of PROFINET interfaces |
1; 2 ports (switch) RJ45 |
| Number of RS 485 interfaces |
1; Combined MPI / PROFIBUS DP |
| Number of RS 422 interfaces |
0 |
| 1. Interface |
| Interface type |
Integrated RS 485 interface |
| Isolated |
Yes |
| Interface types |
| ● RS 485 |
Yes |
| ● Output current of the interface, max. |
200 mA |
| Protocols |
| ● MPI |
Yes |
| ● PROFIBUS DP master |
Yes |
| ● PROFIBUS DP device |
Yes |
| ● Point-to-point connection |
No |
| MPI |
| ● Transmission rate, max. |
12 Mbit/s |
| Services |
| — PG/OP communication |
Yes |
| — Routing |
Yes |
| — Global data communication |
Yes |
| — S7 basic communication |
Yes |
| — S7 communication |
Yes |
| — S7 communication, as client |
No; but via CP and loadable FB |
| — S7 communication, as server |
Yes |
| PROFIBUS DP master |
| ● Transmission rate, max. |
12 Mbit/s |
| ● max. number of DP devices |
124 |
| Services |
| — PG/OP communication |
Yes |
| — Routing |
Yes |
| — Global data communication |
No |
| — S7 basic communication |
Yes; I blocks only |
| — S7 communication |
Yes |
| — S7 communication, as client |
No |
| — S7 communication, as server |
Yes |
| — Equidistance |
Yes |
| — Isochronous mode |
Yes; OB 61; isochronous mode can only be used alternatively on PROFIBUS DP or PROFINET IO |
| — SYNC/FREEZE |
Yes |
| — activation/deactivation of DP devices |
Yes |
| — max. number of DP devices that can be activated/deactivated at the same time |
8 |
| — Direct data exchange (slave-to-slave communication) |
Yes; as subscriber |
| — DPV1 |
Yes |
| Address area |
| — Inputs, max. |
2 kbyte |
| — Outputs, max. |
2 kbyte |
| User data per DP device |
| — Inputs, max. |
244 byte |
| — Outputs, max. |
244 byte |
| PROFIBUS DP device |
| ● Transmission rate, max. |
12 Mbit/s |
| ● automatic baud rate search |
Yes; only with passive interface |
| ● Address area, max. |
32 |
| ● User data per address area, max. |
32 byte |
| Services |
| — PG/OP communication |
Yes |
| — Routing |
Yes; Only with active interface |
| — Global data communication |
No |
| — S7 basic communication |
No |
| — S7 communication |
Yes |
| — S7 communication, as client |
No |
| — S7 communication, as server |
Yes; Connection configured on one side only |
| — Direct data exchange (slave-to-slave communication) |
Yes |
| — DPV1 |
No |
| Transfer memory |
| — Inputs |
244 byte |
| — Outputs |
244 byte |
| 2. Interface |
| Interface type |
PROFINET |
| Isolated |
Yes |
| automatic detection of transmission rate |
Yes; 10/100 Mbit/s |
| Autonegotiation |
Yes |
| Autocrossing |
Yes |
| Change of IP address at runtime, supported |
Yes |
| Interface types |
| ● RJ 45 (Ethernet) |
Yes |
| ● Number of ports |
2 |
| ● integrated switch |
Yes |
| Protocols |
| ● MPI |
No |
| ● PROFINET IO Controller |
Yes; Also simultaneously with IO-Device functionality |
| ● PROFINET IO Device |
Yes; Also simultaneously with IO Controller functionality |
| ● PROFINET CBA |
Yes |
| ● PROFIBUS DP master |
No |
| ● PROFIBUS DP device |
No |
| ● Open IE communication |
Yes; Via TCP/IP, ISO on TCP, and UDP |
| ● Web server |
Yes |
| ● Media redundancy |
Yes |
| PROFINET IO Controller |
| ● Transmission rate, max. |
100 Mbit/s |
| Services |
| — PG/OP communication |
Yes |
| — Routing |
Yes |
| — S7 communication |
Yes; With loadable FBs, max. configurable connections: 14, max. number of instances: 32 |
| — Isochronous mode |
Yes; OB 61; isochronous mode can only be used alternatively on PROFIBUS DP or PROFINET IO |
| — IRT |
Yes |
| — Shared device |
Yes |
| — Prioritized startup |
Yes |
| — Number of IO devices with prioritized startup, max. |
32 |
| — Number of connectable IO Devices, max. |
128 |
| — Of which IO devices with IRT, max. |
64 |
| — of which in line, max. |
64 |
| — Number of IO Devices with IRT and the option "high flexibility" |
128 |
| — of which in line, max. |
61 |
| — Number of connectable IO Devices for RT, max. |
128 |
| — of which in line, max. |
128 |
| — Activation/deactivation of IO Devices |
Yes |
| — Number of IO Devices that can be simultaneously activated/deactivated, max. |
8 |
| — IO Devices changing during operation (partner ports), supported |
Yes |
| — Number of IO Devices per tool, max. |
8 |
| — Device replacement without swap medium |
Yes |
| — Send cycles |
250 μs, 500 μs,1 ms; 2 ms, 4 ms (not in the case of IRT with "high flexibility" option) |
| — Updating time |
250 µs to 512 ms (depending on the operating mode, see Manual "S7-300 CPU 31xC and CPU 31x, technical Data" for more details) |
| Address area |
| — Inputs, max. |
2 kbyte |
| — Outputs, max. |
2 kbyte |
| — User data consistency, max. |
1 024 byte |
| PROFINET IO Device |
| Services |
| — PG/OP communication |
Yes |
| — Routing |
Yes |
| — S7 communication |
Yes; With loadable FBs, max. configurable connections: 14, max. number of instances: 32 |
| — Isochronous mode |
No |
| — IRT |
Yes |
| — PROFIenergy |
Yes; With SFB 73 / 74 prepared for loadable PROFIenergy standard FB for I-Device |
| — Shared device |
Yes |
| — Number of IO Controllers with shared device, max. |
2 |
| Transfer memory |
| — Inputs, max. |
1 440 byte; Per IO Controller with shared device |
| — Outputs, max. |
1 440 byte; Per IO Controller with shared device |
| Submodules |
| — Number, max. |
64 |
| — User data per submodule, max. |
1 024 byte |
| PROFINET CBA |
| ● acyclic transmission |
Yes |
| ● cyclic transmission |
Yes |
| Open IE communication |
| ● Number of connections, max. |
8 |
| ● Local port numbers used at the system end |
0, 20, 21, 23, 25, 80, 102, 135, 161, 443, 8080, 34962, 34963, 34964, 65532, 65533, 65534, 65535 |
| ● Keep-alive function, supported |
Yes |
| Protocols |
| PROFIsafe |
No |
| Redundancy mode |
| Media redundancy |
| — Switchover time on line break, typ. |
200 ms; PROFINET MRP |
| — Number of stations in the ring, max. |
50 |
| Open IE communication |
| ● TCP/IP |
Yes; via integrated PROFINET interface and loadable FBs |
| — Number of connections, max. |
8 |
| — Data length for connection type 01H, max. |
1 460 byte |
| — Data length for connection type 11H, max. |
32 768 byte |
| — several passive connections per port, supported |
Yes |
| ● ISO-on-TCP (RFC1006) |
Yes; via integrated PROFINET interface and loadable FBs |
| — Number of connections, max. |
8 |
| — Data length, max. |
32 768 byte |
| ● UDP |
Yes; via integrated PROFINET interface and loadable FBs |
| — Number of connections, max. |
8 |
| — Data length, max. |
1 472 byte |
| Web server |
| ● supported |
Yes |
| ● User-defined websites |
Yes |
| ● Number of HTTP clients |
5 |
| Communication functions |
| PG/OP communication |
Yes |
| Data record routing |
Yes |
| Global data communication |
| ● supported |
Yes |
| ● Number of GD loops, max. |
8 |
| ● Number of GD packets, max. |
8 |
| ● Number of GD packets, transmitter, max. |
8 |
| ● Number of GD packets, receiver, max. |
8 |
| ● 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 integrated PROFINET interface and loadable FB or via CP and loadable FB |
| ● User data per job, max. |
See online help of STEP 7 (shared parameters of the SFBs/FBs and of the SFCs/FCs of S7 Communication) |
| S5 compatible communication |
| ● supported |
Yes; via CP and loadable FC |
| PROFINET CBA (at set setpoint communication load) |
| ● Setpoint for the CPU communication load |
50 % |
| ● Number of remote interconnection partners |
32 |
| ● number of master/device functions |
30 |
| ● total of all master/device connections |
1 000 |
| ● data length of all incoming master/device connections, max. |
4 000 byte |
| ● data length of all outgoing master/device connections, max. |
4 000 byte |
| ● Number of device-internal and PROFIBUS interconnections |
500 |
| ● Data length of device-internal und PROFIBUS interconnections, max. |
4 000 byte |
| ● Data length per connection, max. |
1 400 byte |
