Control module STM 21
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B6_Control_SYS20_EN_V1.3.doc
Art. Nr. 102-020401135
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4.
Control module STM 21
4.1.
Controlling elements on STM 21
Control module STM 21 works with an active HIGH level. That means that a minimum of +24V is
required to activate a function. Protective inputs are activated in case of interruption. OV is con-
nected to the ground. This connection can be interrupted for test reasons by use of the ground
screw, located next to terminal 12. LED 2 (red) comes on.
Control module and power supply
ELECTRIC SHOCK
Electric shock, combustion, death if touching the power supply without protec-
tion cover
Before opening the metallic cover of the power supply unit, disconnect it
from the mains
The installation may only be connected to the mains again,
after
the protec-
tion cover has been closed again
The STM 21 control module has been tested after ISO standard 13849-1:2006,
category 2 PLc.
NOTE
DANGER
Control module
STM 21
Fused power
supply
