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 the 140CRP31200, 140 NOC 771 ••, and 140 NOE 771 •• modules within the standard system bits (%SW180 to %SW339).

Ethernet Remote I/O Drop Diagnostics

Ethernet remote I/O drop diagnostics are accessible for the entire drop within system bits and words in the PLC (%S, %SW). Each drop is animated with a health bit display of the health bit status for:

  • a drop node

  • a module in a remote drop

The Quantum PLC on the local rack monitors remote I/O drops and module health. The 140CRA31200 or BMXCRA312•0 adapter module on the remote I/O drop transmits detected errors in drop modules to the Quantum PLC via implicit exchanges. The detected errors are stored in the global diagnostic buffers of the PLC and in the diagnostic buffer of the individual drop module.

The Quantum PLC or the 140CRP31200 module on the local rack updates the detected error buffers. Health bits are updated in the PLC only if the adapter of the concerned drop communicates with the 140CRP31200 module on the local rack. If these modules cannot communicate, the concerned health bits are set to 0.

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

%SW109

FORCED_ANALOG_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

%SW180 ... %SW181

IOHEALTHij

(i = 1 ... 32, j = 1 ... 5)

health bits of the PLC modules (including Hot Standby and Safety Hot Standby systems)

%SW182 ... %SW183

%SW641 ... %SW702

EIO_MOD_HEALTH

Ethernet remote I/O module health bit status
NOTE: Refer to Quantum-Specific System Words section for a detailed explanation.

Viewing Diagnostics in Control Expert

The bus editor in Control Expert uses color animation to display the status of each drop, rack, or module on the EIO Bus. The slot number of the drop/rack/module appears in red when a detected error is associated with that slot. For a module, the red display indicates the module is missing, inoperable, or improperly configured.

Drop

Status

Language Object

i

j
 

drop (d)

%SWi.j

152 + [(d-1)/16]

(d-1)/16

140 CRA

rack (r), drop (d)

%SWi

641 + [(d-1)*2] + (r-1)

  

module (m), rack (r), drop (d)

%SWi.j

641 + [(d-1)*2] + (r-1)

16-m

BMX CRA

rack (r), drop (d)

%SWi

641 + [(d-1)*2] + r

  

module (m), rack (r), drop (d)

%SWi.j

641 + [(d-1)*2] + r

15-m
NOTE: Remember that the 16 slots have different numbering schemes:

  • 140CRA31200 drop: slots 1...16

  • BMXCRA312•0 drop: slots 0...15

NOTE: Remember that the rack numbering scheme is also different:

  • 140CRA31200 drop: 1 or 2

  • BMXCRA312•0 drop: 0 or 1