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The Leader in Industrial Data Communication Solutions

The Leader in Industrial Data Communication Solutions. Troubleshooting Tips. Troubleshooting Tips. General Clarify symptoms Isolate comms from PLC network Perform loopback or PING tests Check diagnostic information If communications are verified, consider PLC system:

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The Leader in Industrial Data Communication Solutions

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  1. The Leader in Industrial Data Communication Solutions Troubleshooting Tips

  2. Troubleshooting Tips • General • Clarify symptoms • Isolate comms from PLC network • Perform loopback or PING tests • Check diagnostic information • If communications are verified, consider PLC system: • Improper RSLinx configuration? • Latency causing timeouts? • Program problems?

  3. Larry’s Rockwell Tips • General Comments • Rockwell’s example PLC programs work very well • Noisy phone lines or less than ideal wireless links: • Greater retries (latency) • Do not exceed throughput capacity • Consolidate data to minimize number of MSGs • A few MSGs with larger amounts of data is faster

  4. Larry’s Rockwell Tips • SRM Wireless Ethernet Modem • Equipment attached to remote modems do not directly communicate • Use Ethernet switches, not hubs • IGMP snooping preferred

  5. Larry’s Rockwell Tips • DF1 Protocol • No limitations with Data-Linc modems • Prefer STD Polling Mode (multiple MSGs per scan) • DF1 master PLC will relay MSGs • “Missing Remote” Failure (not with Logix platforms)

  6. Larry’s Rockwell Tips • DF1 Protocol • “Missing Remote” Failure (not with Logix platforms) • On SLCs do this:

  7. Larry’s Rockwell Tips • NOT this: Reason: • With SLC or MicroLogix multiple enabled MSGs are queued in the transmit buffer. While queued their Timeout interval is timing. If a current MSG times out all others queued will timeout giving the appearance that multiple slaves have failed.

  8. Larry’s Rockwell Tips • Multi-drop Channel Pass-Through is a wonderful thing!

  9. Larry’s Rockwell Tips • Logix Platforms • These machines can REALLY move data and quickly overwhelm a radio network. As always, do not exceed the network’s throughput capability. • Be mindful of RPI. Ten 32 bit words with an RPI of 10 milliseconds is 32kbps without even considering protocol overhead!

  10. Larry’s Rockwell Tips • RSLinx • Red Xs can appear intermittently when using low baud rates (1200 baud) depending on communication quality and other communication traffic. This is normal. • DF1 Polling Master Driver. • The parameters Max Pkt Wait Time (Sec) and Max Retransmission Wait Time (Sec) and not well documented. • Values that have worked well: • Max Pkt Wait Time: 8 (default 150) • Max Retransmission Wait Time: 15 (default 600)

  11. Larry’s Rockwell Tips

  12. The Leader in Industrial Data Communication Solutions THANK YOU!

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