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Troubleshooting
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372 SPU 780 01EMAN May 2002
Communication Status
Communication
Status 1/2 (S901)
The Remote I/O communication Status Word 1 shows errors and normal operating
indication of the indicated channel pair. Under normal operating conditions the lower
byte should be counting and the upper portion of the byte should match the lower
portion of the byte.
Any bits set in the upper byte indicates an error condition for the channel pair. Note
that a disconnected channel pair or a channel pair that does not exist will set the
function scheduled to 001 (Restart - communication reset).
Function Schedule:
Binary Number Description
000 Normal I/O
001 Restart (comm reset)
010 Restart (application reset)
100 Inhibit
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 = Current message not supported
1 = Response message count > transmitted byte count
1 = Response from remote interface not what expected
Function schedule
1 = Message from controller is queued
Current message frame # to drop
Cable ID: 0 = Cable 0, 1 = Cable 1
# of next expected frame from drop
1 = Current message not
accepted at drop