Electrical Connection¶
The PROFIBUSâ DP Bus Module CI542-DP is plugged on the I/O Terminal Units TU509 Terminal Units TU509 and TU510 for Bus Modules or TU510 Terminal Units TU509 and TU510 for Bus Modules and accordingly TU517 Terminal Units TU517 and TU518 for Bus Modules or TU518 Terminal Units TU517 and TU518 for Bus Modules. Properly seat the module and press until it locks in place. The Terminal Unit is mounted on a DIN rail or with 2 screws plus the additional accessory for wall mounting (TA526 Wall Mounting Accessory TA526).
The electrical connection of the I/O channels is carried out using the 30 terminals of the I/O Terminal Unit. I/O modules can be replaced without re-wiring the Terminal Units.
Note
Mounting, disassembling and electrical connection for the Terminal Units and the I/O modules are described in detail in System Data System Data AC500.
The terminals 2.8 and 3.8 as well as 2.9, 3.9 and 4.9 are electrically interconnected within the Terminal Unit and have always the same assignment, independent of the inserted module:
Terminals 2.8 and 3.8: Process supply voltage UP = +24 V DC
Terminal 4.8: Process supply voltage UP3 = +24 V DC
Terminals 2.9, 3.9 and 4.9: Process supply voltage ZP = 0 V
Note
With a separate UP3 power supply, the digital outputs can be switched off externally. With this, an emergency-off functionality can be realised.
Note
Do not connect any voltages externally to digital outputs!
This ist not intended usage.
Reason: Externally voltages at one or more terminals DC0..DC7 or DO0..DO7 may cause that other digital outputs are supplied through that voltage instead of voltage UP3 (reverse voltage).
This is also possible, if DC channels are used as inputs. For this, the source for the input signals should be the impressed UP3 of the device.
This limitation does not apply for the input channels DI0..DI7.
Caution
:strong:Risk \ of malfunction by not intended usage!
If the function cut off of the digital outputs should be used by deactivation of the supply voltage UP3, be sure that no external voltage is conncted at the outputs DO0..DO7 and DC0..DC7.