348
Description Intermittent Communications on IONet1 – Packet Loss Exceeded [ ]%
Possible Cause
• Power cycled on I/O producer (controller or I/O module)
• Faulty Ethernet cable from I/O pack to IONet switch and/or from IONet switch to controller.
• Faulty IONet switch
• I/O message corruption
• Communication errors occurred on more than 5% of data transmissions on IONet1
Solution
• Check for evidence of I/O pack restart (diagnostic alarms, error logs).
• Replace Ethernet cable(s).
• Replace the I/O pack.
• Move the I/O pack’s Ethernet cable into an empty IONet switch port. If problem persists, replace the IONet switch.
349
Description Intermittent Communications on IONet2 – Packet Loss Exceeded [ ]%
Possible Cause
• Power cycled on I/O producer (controller or I/O module)
• Faulty Ethernet cable from I/O pack to IONet switch and/or from IONet switch to controller.
• Faulty IONet switch
• I/O message corruption
• Communication errors occurred on more than 5% of data transmissions on IONet2
Solution
• Check for evidence of I/O pack restart (diagnostic alarms, error logs).
• Replace Ethernet cable(s).
• Replace the I/O pack.
• Move the I/O pack’s Ethernet cable into an empty IONet switch port. If problem persists, replace the IONet switch.
350
Description Intermittent Communications on IONet3 – Packet Loss Exceeded [ ]%
Possible Cause
• Power cycled on I/O producer (controller or I/O module)
• Faulty Ethernet cable from I/O pack to IONet switch and/or from IONet switch to controller.
• Faulty IONet switch
• I/O message corruption
• Communication errors occurred on more than 5% of data transmissions on IONet3
Solution
• Check for evidence of I/O pack restart (diagnostic alarms, error logs).
• Replace Ethernet cable(s).
• Replace the I/O pack.
• Move the I/O pack’s Ethernet cable into an empty IONet switch port. If problem persists, replace the IONet switch.
54 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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