Electrical Connection¶
The electrical connection is carried out by using a removable 9-pin terminal block. These terminal blocks differ in their connection system (spring terminals or screw terminals, cable mounting from the front or from the side). For more information, please refer to the chapter terminal blocks for S500-eCo I/O modules TA563-TA565 - Terminal Blocks. The terminal blocks are not included in the module’s scope of delivery and must be ordered separately.
The following block diagram shows the internal construction of the digital inputs:
| Terminal | Signal | Description |
|---|---|---|
| 1 | C0 … 7 | Input common for signals I0 to I7 |
| 2 | I0 | Input signal I0 |
| 3 | I1 | Input signal I1 |
| 4 | I2 | Input signal I2 |
| 5 | I3 | Input signal I3 |
| 6 | I4 | Input signal I4 |
| 7 | I5 | Input signal I5 |
| 8 | I6 | Input signal I6 |
| 9 | I7 | Input signal I7 |
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 10 mA per DI561.
An external power supply connection is not needed.
Warning
:strong:Removal/Insertion under power
The devices are not designed for removal or insertion under power. Because of unforeseeable consequences, it is not allowed to plug or unplug devices with the power being ON.
Make sure that all voltage sources (supply and process voltage) are switched off before you
- connect or disconnect any signal or terminal block
- remove, mount or replace a module.
Disconnecting any powered devices while energized in a hazardous location could result in an electric arc, which could create a flammable ignition resulting in fire or explosion.
Make sure that power is removed and that the area has been thoroughly checked to ensure that flammable materials are not present prior to proceeding.
The devices must not be opened when in operation. The same applies to the network interfaces.
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 digital inputs can be used as source inputs or as sink inputs.
Attention
:strong:Risk of malfunctions in the plant!
A ground closure, e. g. caused by a damaged cable insulation, can bridge switches accidentally.
Use sink inputs when possible or make sure that, in case of error, there will be no risks to persons or plant.
The following figure shows the electrical connection of the digital input module DI561:
| Electrical connection of DI561 - sink inputs | Electrical connection of DI561 - source inputs |
The module provides several diagnosis functions DI561 - Digital Input Module.
The meaning of the LEDs is described in the section State LEDs DI561 - Digital Input Module.