Wiring
3-4
IM 178-4
C79000-G7076-C178-01
3.2
Description of the Individual Pins (Notes, Explanations)
24 V Power Supply
For the power supplies of the IM 178-4, connect a DC voltage of 24 V to pins 1L+
and M and 2L+ and 2M.
!
Caution
Make sure that the polarity of the 24 V power supply is correct otherwise the
module will be damaged.
The 24 V power supply must meet the following requirements:
Only an extra-low DC voltage of
≤
60 V that is safely isolated from the main power
supply must be used as the 24 V power supply. Safe isolation of the power supply
can be achieved by adhering to the requirements of VDE 0100 Part 410 / HD
384-4-41 / IEC 364-4-41 (as functional extra-low voltage with safe isolation) or
VDE 0805 / EN 60950 / IEC 950 (as safety extra-low voltage SELV) or VDE 0106
Part 101.
5.2 V and 24 V Sensor Power Supplies
From the 24 V power supply 1L+/M, the module generates a voltage of 5.2 V. This
voltage is applied to DC5.2V (pin 2) as a short-circuit proof power supply for the
sensors and can accept a maximum load of 600 mA. The ground of the sensor
power supply is connected to M (Pin 1).
For sensors that require a power supply of 24 V, the short-circuit protected
auxiliary voltage is available at DC24V (Pin 3).
Note
A short-circuit of the 5.2 V sensor power supplies leads to a failure of the module.
Sensor Pins
Per channel, you can connect two different sensor types using shielded cables, as
follows:
S
Incremental sensors complying with RS 422:
The signals A, A, B, B and N, N are connected via the correspondingly labeled
pins.
S
SSI position encoders:
The signals SDI, SDI and CLS, CLS are connected to the correspondingly
labeled pins.
