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

8-Channel Analog Output MTA
6.3

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 15 VDC and turn on the LED indicator. The LEDs are
marked A POWER and B POWER. There is also a connector (J3) for a Power
Monitor board used to indicate the presence of both A and B power. See Section
19, Power Monitor Board (6ES7650-1BA02-0XX0).
Incoming power from A and B is diode OR'd, in CR106, to provide the MTA and
the module power from either input source. The output from CR106 is sent to the
I/O modules via the module fuses. Module Fuse 1 (F100) supplies the I/O module
plugged into J1 and Module Fuse 2 (F101) supplies power to the I/O module
plugged into J2. The channels do not require power from the I/O power supply and
therefore no channel power circuitry is required.
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 from J1 and J2 are diode OR'd, via CR1-
CR16, before connecting to CHx+ of the Field terminals. Redundant operation
uses two modules with one each connected to J1 and J2, while non-redundant
systems have one module connected to either J1 or J2.
The field termination connector is removable for ease of wiring maintenance and is
retained by friction.
6.4

Installation Requirements

See Section 2, Installation, before performing any installation and observe all
warnings
A common interconnecting cable (6ES7922-3BD00-0AS0 or 6ES7922-3BJ00-
0AS0), supporting eight analog output channels, interconnects the analog output
termination assembly to the 8-channel analog output module (6ES7 332-5HF00-
0AB0, E-Stand 3 or higher). See Figure 2-11.
It may be necessary to modify the printed circuit board as follows:
To separate channel input low from power supply common, cut and remove the
jumper W200.
Note
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.
6.5

Maintenance

See Section 3, Maintenance, before performing any maintenance and observe all
warnings
Under normal operation, the A/B Power LED and Module 1/2 Fuse LED are on. If
both are off, check the power supply to MTA. If the A/B Power LED is off, check
the power supply to the MTA. If Module 1/2 Fuse LED is off, check the module
fuse and replace if necessary.
62
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12