Electrical Connection¶
The input module is plugged on the I/O Terminal Unit TU515 or TU516 I/O Terminal Units TU515 and TU516 for I/O Expansion 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 40 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 S500 System Data S500 System Data, Overview chapters.
The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the I/O Terminal Unit and have always the same assignment, independent of the inserted module:
Terminals 1.8 to 4.8: Process voltage UP = +24 V DC
Terminals 1.9 to 4.9: Process voltage ZP = 0 V
The assignment of the other terminals:
| Terminals | Signal | Meaning |
|---|---|---|
| 1.0 to 1.7 | I0 to I7 | 8 digital inputs |
| 2.0 to 2.7 | I8 to I15 | 8 digital inputs |
| 3.0 to 3.7 | I16 to I23 | 8 digital inputs |
| 4.0 to 4.7 | I24 to I31 | 8 digital inputs |
The internal power supply voltage for the module’s circuitry is carried out via the I/O-Bus (provided by a Bus Module or a CPU). Thus, the current consumption from 24 V DC power supply at the terminals L+/UP and M/ZP of the CPU/Bus Module increases by 2 mA per DI524.
The external power supply connection is carried out via the UP (+24 V DC) and the ZP (0 V DC) terminals.
Attention
: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 module provides several diagnosis functions Digital Input Module DI524.
The following figure shows the electrical connection of the digital input module DI524.
Figure: Electrical connection of the digital input module DI524