Connecting the inputs and outputs:
● Recommended connection: Inputs and outputs connected to the same supply
If both inputs and outputs are operated with the same 24 V supply.
3
','2
','2
0
','2
','2
0
'&9
● Not recommended connection: Inputs and outputs on different supplies
3
','2
','2
0
','2
','2
0
'&9
'&9
NOTICE
Exceeding the permissible input current
If the inputs and outputs are supplied separately with power, the input current can exceed
the permissible value of 15 mA according to EN61131-2, and the signal source can be
overloaded.
X242 pin assignment
Pin Signal name NC variable Meaning
1 Not connected
2 Not connected
3 IN1 DIN1 $A_IN[1] Digital NC input 1
4 IN2 DIN2 $A_IN[2] Digital NC input 2
5 IN3 DIN3 $A_IN[3] Digital NC input 3
6 IN4 DIN4 $A_IN[4] Digital NC input 4
7 M4 MEXT4 Ground for pins 3...6
8 P3 P24EXT3 +24 V power supply
9 O1 DOUT1 $A_OUT[1] Digital NC output 1
10 O2 DOUT2 $A_OUT[2] Digital NC output 2
11 M3 MEXT3 Ground for pins 9, 10, 12, 13
Interface description
7.4 Digital inputs/outputs
PPU 1740
72 Equipment Manual, 01/2019, A5E47615272B AA
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