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.
|
%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 |
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 . 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 |
140CRA31200 drop: slots 1...16
BMXCRA312•0 drop: slots 0...15
140CRA31200 drop: 1 or 2
BMXCRA312•0 drop: 0 or 1