Rockwell Automation Publication 1718-UM001A-EN-E - December 2019
19
Product Specifications
Chapter 1
prevents terminal blocks from being accidentally plugged into another I/O
module.
Figure 17 - KF-CP coding pins
Watchdog plugs
The watchdog plug is used with digital outputs with a feedback input
(FB2201B - FB2213E). 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 18 -
Block diagram for the LB9180
Resistor network
Most I/O modules have a line fault detection function that can recognize a
lead breakage or a short circuit.
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.
To do this, the resistor network must be positioned directly on the field device.
WARNING:
Risk of confusing device connections.
When coding the front sockets of the I/O modules, ensure that the codes are
mutually exclusive. Otherwise there is the danger of incorrect mapping between
devices and circuits in explosion-hazardous areas.
LB9180
1 kΩ
-
5
-
6
4
2,4 kΩ
+
-
+
+
3
2
1