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 2.8 and 1.9 to 2.9 are electrically interconnected within the I/O terminal unit and always have the same assignment, irrespective of the inserted module:
| Terminals 1.8 to 2.8: | Process voltage UP = +24 VDC |
| Terminals 1.9 to 2.9: | Process voltage ZP = 0 V |
| Terminal 3.8: | Process voltage UP3 = +24 VDC |
| Terminal 3.9: | Process voltage ZP3 = 0 V |
| Terminal 4.8: | Process voltage UP4 = +24 VDC |
| Terminal 4.9: | Process voltage ZP4 = 0 V |
| Terminals | Signal | Description |
|---|---|---|
| 3.0, 3.1, 3.4, 3.5 | O0 to O3 | 4 digital outputs |
| 4.0, 4.1, 4.4, 4.5 | O4 to O7 | 4 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 DO526.
The external power supply connection is carried out via the UP, UP3, UP4 (+24 VDC) and the ZP, ZP3, ZP4 (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:
Electrical connection of the module
The module provides several diagnosis functions DO526 - Digital Output Module.