88 Control unit
Isolation areas
The terminals on the control board fulfill the Protective Extra Low Voltage
(PELV) requirements (EN 50178): There is reinforced insulation between the
user terminals which only accept ELV voltages and terminals that accept
higher voltages (relay outputs).
Note: There is reinforced insulation also between the individual relay outputs.
Note:
There is reinforced insulation on the power unit.
Symbol Description
Reinforced insulation (IEC/EN 61800-5-1:2007)
19…21
RO1
22…24
RO2
25…27
RO3
SLOT 3
Embedded fieldbus module
34…38
STO
40, 41
Ext. 24 V
Power unit
connection
10…12
24 V
GND
13…15
DI
16…18
DI
1…3
AI1
4…6
AI2
7…8
AO
SLOT 1
Fieldbus module
SLOT 2
I/O
extension
module
Panel port
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