Schneider Electric Processor Adapter Words 16, 17 High Word Not used, always, Words 18, Words 20

Using the Ethernet Port

Description, Continued

Words 16, 17 High Word: Not used, always 0

Low Word: Peak Collision Detector

This field contains the number of consecutive collisions that occurred before the frame was successfully transmitted out onto the Ethernet. Most transmitted frames have zero collisions. Some have one collision on the first transmit attempt and succeed on the second attempt. Some have more than one collision followed by success. The largest number of consecutive collisions, since clear statistics command, is stored and displayed in this field.

Receiver Errors

Words 18, 19	Counts the number of received frames addressed to this node that are greater than
Framing Errors	320 bytes in length. Any such large frame has no relevance to the M1 Ethernet
	adapter and therefore is skipped.
	This error should not occur.
Overflow Errors
	Increments whenever a received frame cannot be copied into the frame buffer,
	because the frame buffer is full. This situation should never occur under legal
	Ethernet traffic.
Words 20, 21	Increments when the received packet is received under any of the following error
CRC Errors	conditions:
	λ	CRC error
	λ	Extra data error
	λ	Runt error
	This counter can be made to increment by continuously disconnecting and
	reconnecting the M1 Ethernet cable during cyclic communication.

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