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X21 ASSIGNMENT
1 PE (potential earthing)
2 ground M1
3 input 0/M1
4 input 1/M1
5 ground M24 / 24V supply for the Profi bus card
6 ground M2
7 input 2/M2
8 input 3/M2 / special function = Motorpoti enable
9 +24V / 24V supply for the Profi bus card
* Loading: I
X5.1.20
+ I
X5.2.20
+ I
X21.9
≤ max. 80mA
TAB. 25 PIN ASSIGNMENT X21
The inputs 0 and 1 refer to ground M1, the inputs 2 and 3 refer to ground M2. To connect simple
transmitters like limit switches, etc., a 24V power supply is also available. The input IN3 (PIN 8) is
taken up by a special function.
Therefore, connection could for instance be as follows:
FIG. 17 SPECIAL FUNCTION MOTORPOTI
local: Switch closed
remote: Switch open