Siemens ET 200M Manual page 89

For a non-redundant I/O module, the Ix- connects to the I/O module input via the
diodes on Diode Board 1. The diodes on Diode Board 1 conduct the signal to the
non-redundant module plugged into J2. In this case the diodes on board 2 are
passive. Non-redundant modules should be plugged into J2 to insure the best
common-mode rejection. Non-redundant operation uses the MTA, two Zener Diode
Boards, one FET Switch Adapter, and the FAI module. A simplified diagram of
Non-redundant use of the FAI module and MTA is shown in Figure 9–2.
Note
Use of the FAI MTA for non-redundant operation requires that the FAI I/O to MTA
cable be installed into J2 on the MTA.
Figure 9–1 Redundant FAI Interface
+
CURRENT
SOURCE
-
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12
FAI MTA
FET SWITCH BOARD
1
FET SWITCH
6.2 V
1
J1
FET SWITCH
1
FET SWITCH
FET SWITCH BOARD
1
FET SWITCH
J2
5.6 V
1
FET SWITCH
1
FET SWITCH
6-Channel F Analog Input MTA
2
2
MANA
2
FAI MODULE A
2
2
MANA
2
FAI MODULE B
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