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372 SPU 780 01EMAN May 2002 289
Global Errors
Global Errors
Figure 1
Status Word Description
179 The Global Communication Status. This word stores communications status
for both cable A and cable B. Cable A is the main cable connecting the
remote I/O Processor to the Remote I/O Interface. Cable B is the optional
secondary or redundant cable. The specific information stored is shown in
the figure below.
180 Global Cumulative error counter for cable A. High byte - Framing error count
/ Low byte - No response count. Errors counted here cause the error counters
in Cable A Errors, p. 282 to increment.
181 Global Cumulative error counter for cable B. High byte - Framing error count
/ Low byte - No response count. Errors counted here cause the error counters
in Cable B Errors (169) to increment.
Note: It is possible for bits 2 and 3 to be ‘1’ and bit 1 to be ‘0’ "Cables (171)"
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Dropout counter Retry counter
0 = Cable B status error
0 = Cable A status error
0 = Communication health error