Siemens ET 200M, Manual, Page: 120 / 284

6-Channel F Analog Input HART MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
120 A5E00482820-12
10.4 Installation Requirements
See Section 2, Installation , before performing any installation and observe all
warnings
A common interconnecting cable (6ES7922-3BD00-0AU0 or 6ES7922-3BJ00-
0AU0), supporting six analog input channels, interconnects the analog input
termination assembly to the 6-channel analog input module (6ES7 336-4GE00-
0AB0).
It may be necessary to modify the printed circuit board as follows:
To disconnect the interconnecting cable shield from ground at the MTA only, cut
and remove the shield disconnect jumper, W100 and W101 , for the associated
cable.
Note
To separate channel input low from power supply common, cut and remove the
jumper W200 . This will provide isolation between the all the inputs and power
return.
10.5 Maintenance
See Section 3, Maintenance , before performing any maintenance and observe all
warnings.
Under normal operation, the
A/B Power LED,
the
Module 1/2 Fuse LED,
and all
the
Channel Fuse LEDs
are on. If all are off, check the power supply to MTA. If
the
A/B Power LED
is off, check the power supply to the MTA. If the
Module 1/2
Fuse LED
is off, check and replace the module fuse. If the
Channel Fuse LED
is
off, check the channel fuse and replace as necessary.
Periodically the diode boards should be tested to verify that the zener diodes will
operate correctly. Testing consists of connecting a DC power supply with a current-
limiting series resistor across each diode. The power supply should provide <=20
mA at 15 to 24 VDC. The voltage measured across the zener diodes on the #1
board should be the device's nominal specification of 6.2 VDC and on the #2 board
should be the device's nominal specification of 5.6 VDC.
Note
Correct power down and power up of the FAI module is crucial to the proper
operation of the system. The proven procedure for removal and re-installation of
the FAI module is as follows:
1. Remove the MTA-I/O cable connector from the FAI module.
2. Remove the FAI module from the backplane.
3. Perform FAI module maintenance as required.
4. Reinstall the FAI module into the backplane.
5. Reinstall the MTA-I/O cable connector onto the FAI module.