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6-Channel F Analog Input MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12
101
9.13
Zener Diode Boards
Part No. 6ES7650-1BB51-0XX0 or 6ES7650-1BB50-0XX0 and 6ES7650-1BC51-
0XX0 or 6ES7650-1BC50-0XX0
9.13.1
Description
This section contains installation information and requirements for the two Siemens
Zener Diode Boards. The 6.2 VDC (6ES7650-1BC51-0XX0 or 6ES7650-1BC50-
0XX0 ) and the 5.6 VDC (6ES7650-1BB51-0XX0 or 6ES7650-1BB50-0XX0) are
used on the ET200M Marshalled Termination Assembly (MTA) (6ES7650-1AH51-
5XX0 or 6ES7650-1AH50-5XX0) designed to interface with the Siemens ET 200M
6-Channel F Analog Input Module (6ES7 336-1HE00-0AB0, E-Stand 4 or higher).
Note: The two part numbers for the 5.6 V Diode Board are interchangeable. The
two part numbers for the 6.2 V Diode Board are also interchangeable. Do not
interchange 5.6 V Diode Boards with 6.2 V Diode Boards.
9.13.2
Operation
The 6.2 VDC and the 5.6 VDC Zener Diode Board allows proper operation of the 6
Channel Failsafe Analog Input Module with the MTA. Because the FAI may only be
used in current mode when used in the Safety mode, diodes are placed in parallel
with the module inputs. One diode spans one channel on one module; therefore,
one diode board handles one module. The diodes are normally not conducting but
when a module or the interconnecting cable is removed, the diodes conduct and
keep the current constant for the other module. In a redundant system none of the
diodes normally conducts, but in a non-redundant system one set is always
conducting. Figure 9–9 shows a simplified schematic.
Summary of Contents for ET 200M
Page 8: ...Preface Marshalled Termination Assemblies for ET200M Remote I O Modules 8 A5E00482820 12 ...
Page 16: ...Contents Marshalled Termination Assemblies for ET200M Remote I O Modules 16 A5E00482820 12 ...
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