Diagnostics Available through the CPU

Introduction

System diagnostics are performed locally on the CPU with system bits (%S) and system words (%SW).

Local Rack Diagnostics

Local rack diagnostics are accessible for 140 NOC 78• 00, 140 NOC 771 ••, and 140 NOE 771 •• modules within the standard system words (%SW180 to %SW183).

System Bits and Words

This table describes new or modified system bits and words that represent detected errors:

System Bits/Words	Symbol	Description
%S117	EIOERR	detected remote I/O error on the Ethernet I/O network
%SW101	EIO_ CCOTF_COUNT	EIO CCOTF counting status register
%SW108	FORCED_DISCRETE_COUNT	forced bit counting status register
%SW152 ... %SW153	EIO_DROP_ERROR	detected Ethernet remote I/O drop status The bit is set to 0 if at least one I/O module in the drop as a detected error. The bit is set to 1 if all modules are operating properly. %SW152.0: drop #1 %SW152.1: drop #2 ........ %SW153.14: drop #31
%SW172 ... %SW175	EIO_CONNECT_STATUS	Ethernet I/O communication health status for drops in standalone and primary systems
%SW176 ... %SW179	SDBY_EIO_CONNECT_STATUS	Ethernet I/O communication health status for drops in standby systems
%SW641 ... %SW702	EIO_MOD_HEALTH	Ethernet remote I/O module health bit status

NOTE: Refer to the EcoStruxure™ Control Expert, System Bits and Words, Reference Manual for a detailed explanation of system bits and words.