Cable Length¶
The maximum possible cable length of a PROFIBUSâ subnet within a segment depends on the baud rate (transmission rate).
| Baud rate | Maximum cable length |
| 9.6 kBaud to 187.5 kBaud | 1200 m |
| 500 kBaud | 400 m |
| 1.5 MBaud | 200 m |
| 3 MBaud to 12 MBaud | 100 m |
The assignment of the other terminals:
| Terminal | Signal | Meaning |
|---|---|---|
| 2.0 | DC0 | Signal of the configurable digital input/output DC0 |
| 2.1 | DC1 | Signal of the configurable digital input/output DC1 |
| 2.2 | DC2 | Signal of the configurable digital input/output DC2 |
| 2.3 | DC3 | Signal of the configurable digital input/output DC3 |
| 2.4 | DC4 | Signal of the configurable digital input/output DC4 |
| 2.5 | DC5 | Signal of the configurable digital input/output DC5 |
| 2.6 | DC6 | Signal of the configurable digital input/output DC6 |
| 2.7 | DC7 | Signal of the configurable digital input/output DC7 |
| 2.8 | UP | Process voltage UP (24 V DC) |
| 2.9 | ZP | Process voltage ZP (0 V DC) |
| 3.0 | DI8 | Signal of the digital input DI8 |
| 3.1 | DI9 | Signal of the digital input DI9 |
| 3.2 | DI10 | Signal of the digital input DI10 |
| 3.3 | DI11 | Signal of the digital input DI11 |
| 3.4 | DI12 | Signal of the digital input DI12 |
| 3.5 | DI13 | Signal of the digital input DI13 |
| 3.6 | DI14 | Signal of the digital input DI14 |
| 3.7 | DI15 | Signal of the digital input DI15 |
| 3.8 | UP | Process voltage UP (24 V DC) |
| 3.9 | ZP | Process voltage ZP (0 V DC) |
| 4.0 | DO8 | Signal of the digital output DO8 |
| 4.1 | DO9 | Signal of the digital output DO9 |
| 4.2 | DO10 | Signal of the digital output DO10 |
| 4.3 | DO11 | Signal of the digital output DO11 |
| 4.4 | DO12 | Signal of the digital output DO12 |
| 4.5 | DO13 | Signal of the digital output DO13 |
| 4.6 | DO14 | Signal of the digital output DO14 |
| 4.7 | DO15 | Signal of the digital output DO15 |
| 4.8 | UP3 | Process voltage UP3 (24 V DC) |
| 4.9 | ZP | Process voltage ZP (0 V DC) |
Caution
:strong:Risk of damaging the PLC modules!
The PLC modules must not be removed when the plant is powered on.
Make sure that all voltage sources (supply and process voltage) are switched off before you are removing or replacing a module.
Caution
:strong:Risk of damaging the PLC modules!
The PLC modules can be damaged by overvoltages and short circuits.
Make sure that all voltage sources (supply and process voltage) are switched off before you are beginning with operations at the system.
The following figures show the electrical connection of the PROFIBUSâ DP Bus Module CI542-DP.
Connection of the Bus Module CI542-DP
Figure: