Horner APG QX351 OCS HEQX351C103 - Manual (Page 105)

MAN0892-03-EN CH.17
February 25, 2010 Page 105 of 109 #1039
To view the system menu, press the System key on the keypad . See Ch.9 for full details on the
system menu diagnostic capabilities.
17.2.1 Local I/O Troubleshooting Checklist
1. Verify the controller is in RUN mode.
2. Check diagnostics to ensure controller passed self-tests.
View diags in System Menu or in Cscape, click; Controller/Diagnostics
3. Check data sheets to ensure proper wiring.
4. Ensure that software configuration is correct.
5. Take ladder out of the picture. From Cscape set controller to “Do I/O” mode. In this mode inputs
can be monitored and outputs set from a data watch window in Cscape without interference from
the ladder program. Some I/O problems are only a result of a mistake in the ladder program.
17.3
CsCAN Network
For complete information on setting up a CsCAN network, refer CAN Networks manual (MAN0799)
available on our website (
http://www.heapg.com/ ).
Network status, node ID, errors, and baud rate in the controller system menu are all in reference to the
CsCAN network. These indications can provide performance feedback on the CsCAN network and can
also be used to aid in troubleshooting. Refer to Ch.9 for full details on the system menu.
17.3.1 CsCAN Network Troubleshooting Checklist
1. Use the proper Belden wire type or equivalent for the network as specified in MAN0799.
2. The QX351 does not provide 24VDC to the network. An external voltage source must be used for
other devices such as SmartStix I/O.
3. Check voltage at both ends of the network to ensure that voltage meets specifications of attached
devices.
4. Proper termination is required. Use 121-ohm (or 120-ohm) resistors at each end of the network. The
resistors should be placed across the CAN_HI and CAN_LO terminals.
5. Measure the resistance between CAN_HI and CAN_LO. If the network is properly wired and
terminated there should be around 60 ohms.
6. Check for duplicate node ID’s.
7. Keep proper wires together. One twisted pair is for V+ and V- and the other twisted pair is used for
CAN_HI and CAN_LO.
8. Make sure the baud rate is the same for all controllers on the network.
9. Ensure shields are connected at one end of each segment -- they are not continuous through the
network.
10. Do not exceed the maximum length determined by the baud rate and cable type.
11. Total drop length for each drop should not exceed 6m (20 feet). A drop may include more than one
node. The drop length adds to the overall network length.
12. Network should be wired in "straight line" fashion, not in a "star" pattern.
13. In applications requiring multiple power supplies, make sure the V- of all supplies is connected
together and to earth ground at one place only.
14. In some electrically noisy environments it may be necessary to add repeaters to the network.
Repeaters can be used to add additional nodes and/or distance to the network and protect the signal
against noisy environments. The Horner APG repeater is part # HE200CGM100.
WARNING: Setting outputs ON in Do I/O mode can result in injury or cause machinery to
engage in an unsafe manner depending on the application and the environment.