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Model MCX-32
Model MCX-32 Instruction Manual
Rev. 2.3
Page 41 of 49
2. If I/O Modules are installed in the controller, ensure that the appropriate RS-485 connector is plugged
into the top module (TB1-J1 or TB2-J1), and the connector to the terminal blocks is plugged into the
bottom module (TB1-J2, or TB2-J2).
a.
Ensure that the Controller Setup is correct for the I/O Module(s) installed (Section 7.0).
b. Ensure that the address of the I/O Module(s) is set correctly.
c.
Ensure that the System Configuration is set properly for communication with the I/O
Module(s) (Section 6.0).
d.
Check the Modbus
™
Utilities to see if there is communication with the I/O Module(s).
e.
The controller should be able to communicate with any I/O module correctly installed. If no
communication can be established the Controller’s Interface PCA is suspect and should be
replaced.
NOTE:
The male connector must be plugged into to the I/O Module at the top (right) of the
din rail and the female connector must be plugged into the I/O Module at the bottom (left) of
the stack of I/O modules. If these connectors are not properly installed, communication with
other RS-485 devices will not be possible.
3. If no modules are installed, insure that the two RS-485 connectors are plugged into each other.
NOTE:
If no I/O Modules are installed in the controller, the male connector must be plugged
into female connector of each Modbus
™
port for the RS-485 to communicate.
If these
connectors are not properly plugged into each other, communication with other RS-485 devices
will not be possible.
4. Connect a working slave device directly to the output terminal blocks of the appropriate port. Make
sure that it is functional and that the controller is able to communicate with the device. If it is not, the
wiring to the terminal blocks, or the Controller’s Interface PCA are suspect and should be checked or
replaced.
5. If the controller is able to communicate with the device connected in Step 4, the controller may be
considered as working. Remove the device connected is in Step 4.
6. Check all of the wiring from the RS-485 terminal blocks to all of the devices connected to the
controller.
7. Start with the first device outside the enclosure and moving away from the controller. One by one
connect each device to the controller, noting if the controller can communicate with each device as it
is connected.
a.
Ensure that the Controller Setup is correct for the device installed (Section. 7.0).
b. Ensure that the address of the device is set correctly.
c.
Ensure that the System Configuration is set properly for communication with the device
(Section 6.0).
d.
Check the Modbus
™
Utilities to see if there is communication with the device.
e.
The controller should be able to communicate with any device correctly installed.
If no
communication can be established the device or wiring should be suspect, and should be
checked.
8. Replace any device that does not communicate properly with the controller.
9. If communication becomes intermittent or bad over a long distance, it may be necessary to install a
Modbus repeater in the network. Contact Detcon Technical Support for assistance.