Operation; Installation Requirements; Maintenance - Siemens ET 200M Manual

8-Channel HART Analog Output MTA
21.3

Operation

Power is supplied via the two removable power connectors which are retained by
screws and marked L+A, MA, and L+B, MB. Each has circuitry to detect the
presence of voltage over 15VDC and turn on the LED indicator. The LEDs are
marked A POWER and B POWER. There is also a connector for a Power Monitor
board used to indicate the presence of both A and B power. See section 16 Power
Monitor Board (6ES7650-1BA02-0XX0).
Incoming power from A and B is diode OR'd to provide the MTA and the module
power from either input source. The output from the ORing diode is sent to the I/O
modules via the module fuses.
Field Terminals, Channel + (CHx+), Channel – (CHx-), and Shield (SHx), connect
to the field devices. CHx+ is the current output source and CHx- is the current
output sink. The I/O module outputs are diode OR'd, on the I/O module, before
connecting to CHx+ of the Field terminals. Redundant operation uses two modules,
while non-redundant systems have one module connected to either I/O module
connector
The field termination connectors are removable for ease of wiring maintenance and
are retained by friction.
21.4

Installation Requirements

See Section 2 Installation, before performing any installation and observe all
warnings
A common interconnecting cable (6ES7922-3BD01-0AM0 or 6ES7922-3BJ01-
0AM0), supporting eight analog input channels, connects the analog input
termination assembly to the 8-channel analog input module (6ES7 331-7TF01-
0AB0). See Figure 4–1.
It may be necessary to modify the cable shield connections on the printed circuit
board.
Note
To disconnect the interconnecting cable shield from ground at the MTA only, cut
and remove the shield disconnect jumpers, Module 1 and Module 2, for the
associated cable.
21.5

Maintenance

See Section 3 Maintenance, before performing any maintenance and observe all
warnings.
Under normal operation, the A/B Power LEDs and Module 1/2 Fuse LEDs are
green. If all are off, check the power supply to MTA. If Module 1/2 Fuse LED is
off, check the module fuse and replace if necessary
264
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12