Pepperl+Fuchs LB Series Manual page 19

LB Remote I/O System
Product Specifications
KF-CP
Figure 2.23
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.
LB9180A
Zone 1, 2
Figure 2.24
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.
F-NR2-Ex1
Figure 2.25
KF-CP coding pins
LB9180A
1 kΩ
2,4 kΩ
Block diagram for the LB9180A
150
Dimensions of the F-NR2-Ex1 resistor network
- 6
- 5
- 4
+ 3
+ 2
+ 1
27
35
19