Electrical Connection¶
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.
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 VDC
Terminals 1.9 to 4.9: process voltage ZP = 0 V
The assignment of the other terminals:
| Terminals | Signal | Description |
|---|---|---|
| 1.0 to 1.7 | O0 to O7 | 8 digital outputs |
| 2.0 to 2.7 | O8 to O15 | 8 digital outputs |
| 3.0 to 3.7 | O16 to O23 | 8 digital outputs |
| 4.0 to 4.7 | O24 to O31 | 8 digital outputs |
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 VDC power supply at the terminals L+/UP and M/ZP of the CPU/bus module increases by 2 mA per DO524.
The external power supply connection is carried out via the UP (+24 VDC) and the ZP (0 VDC) terminals.
Attention
:strong:Risk of damaging the PLC modules!
Overvoltages and short circuits might damage the PLC modules.
- Make sure that all voltage sources (supply and process voltage) are switched off before you begin with operations at the system.
- Never connect any voltages or signals to reserved terminals (marked with —). Reserved terminals may carry internal voltages.
The following block diagram shows the internal construction of the digital outputs:
The module provides several diagnosis functions DO524 - Digital Output Module.