Siemens ET 200M, Руководство пользователя, Страница: 89 / 284

6-Channel F Analog Input MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12 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
FAI MODULE A
2
1
CURRENT
SOURCE
6.2 V
-
1
FET SWITCH
1 2
FAI MTA
FET SWITCH
1 2
FET SWITCH
1 2
MANA
215
O
H
M
1
2
FET SWITCH BOARD
FET SWITCH BOARD
J1
2
1
5.6 V
+
FET SWITCH
1 2
FET SWITCH
1 2
FAI MODULE B
215
O
H
M
1
2
MANA
J2
FET SWITCH
1 2