Pepperl+Fuchs LB Series - Page 19

LB Remote I/O System
Product Specifications
2018-07
19
Figure 2.23 KF-CP coding pins
Watchdog Plugs
The watchdog plug is used with digital outputs with a feedback input (LB2101A ... LB2113E).
The watchdog plug sends the output signal from the I/O module back to its input channel,
making it possible to check the function of the I/O module, as well as the communication
between the process control system and the I/O module.
Figure 2.24 Block diagram for the LB9180A
Resistor Network
If binary I/O modules are used, for example with a mechanical contact, an additional resistor
network must be installed to ensure that the line fault detection function can work correctly.
Using the additional resistor network, the electronics can distinguish between a closed switch
and a short circuit.
Figure 2.25 Dimensions of the F-NR2-Ex1 resistor network
KF-CP
LB9180A
F-NR2-Ex1
Zone 1, 2
LB9180A
1 kΩ
-5
-6
4
2,4 kΩ
+
-
+
+
3
2
1
27
35150
Ø15.5