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11 Troubleshooting
Control Link ACCs
and the ECT
MODBUS
Network
11.1. If Control Link ACC is
Offline
1. Check wiring - Verify the Control Link ACC is
properly connected to the MODBUS cable. Verify
the network polarity is correct (+ to +, - to -, 0V to
0V) and there are no loose wires. If none of the
Control Link ACCs are online, check wiring
connections on the E2. Check the cable jackets to
make sure all network cable is Belden #8761 or
equivalent.
2. Verify MODBUS Port Setup - Press
E2 front panel. Verify COM2, COM4, or COM6 is
set up as a MODBUS port. If so, verify that the
MODBUS cable is connected to the proper
connectors (refer to Figure 7-1 on page 11). Verify
the COM port fields are properly set for ECT
MODBUS (19.2k baud, data size=8 bits,
Parity=NONE, stop bits=1).
3. Make sure Control Link ACCs were commissioned
- Press
followed by
panel and verify the offline Control Link module
has a non-zero number in its Node/Board# field. If
the number in the Node/Board# field is zero (0),
highlight the controller name and select - SET
ADDRESS followed by
select the network ID that matches the setting on the
network address DIP switch/jumper.
4. Check Control Link ACC network card DIP
switch/jumper settings - make sure switches/
jumpers 1-6 on the Control Link ACC network card
match the network ID number of the offline Control
Link ACC.
5. Verify switches/jumpers 7 and 8 are in the DOWN
position - Switches/jumpers 7 and 8 in the DOWN
position specify 19.2k baud and no parity. If either
of these switches/jumpers are not in the DOWN
position, set them DOWN.
If Control Link ACC is Offline
+
on the
on the E2 front
- Select Address. Then
Troubleshooting Control Link ACCs and the ECT MODBUS Network • 31
6. Check network termination - The two devices on
either end of the MODBUS network should be
terminated, with all other devices in the daisy chain
unterminated. Check termination settings for all
devices on the network.
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