Connection notes
1. Recommended connection:
If both inputs and outputs are operated on a digital inputs/outputs group, it is recommended
that both the inputs and the outputs are fed with the same 24 VDC supply:
3
','2
','2
0
','2
','2
0
'&9
Figure 6-1 Inputs and outputs on the same supply
2. Not recommended connection:
If the inputs and outputs supplied separately with power, the input current can exceed the
permissible value of 15 mA according to EN61131-2. This may possibly cause the signal
source to be overloaded:
3
','2
','2
0
','2
','2
0
'&9
'&9
Figure 6-2 Inputs and outputs on different supplies
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
Interface description
6.5 Digital inputs/outputs
PPU and components
Manual, 05/2015, 6FC5397-2DP40-3BA4 77
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