Design and Implementation of HC900 Control System - HC900 Control System Diagnostics
52 HC900 Process & Safety Controller Safety Manual Revision 1.9
01/14
restarted when the RESTART pin is connected on the DO-V and AO-V function blocks. Non Redundant
control system (C30S, C50S, C70S)
•
When the scanner loses communications for two or more normal cycles, outputs will go and remain in
the failsafe state until the controller informs the scanner what to drive the outputs to. The restart pin is
provided to control the outputs resumption of normal operation.
•
Redundant control system (C75S)
When the scanner loses communications to the LEAD for two or more normal scan cycles, transfer of
the LEAD occurs between the controllers if the RESERVE has the ability to communicate with more
scanners over the redundant IO Link, a diagnostics will be posted and normal operation continues.
However if the RESERVE controller does not have the ability to communicate with more scanners the
outputs will go and remain in failsafe until the controller informs the scanner what to drive the outputs
to. The restart pin is provided to control the outputs resumption of normal operation.
•
The user can control the operation when the scanner resumes controlling outputs with proper
configuration and use of AO-V and DO-V’s RESTART pin.
•
The users of redundant controllers should ensure the desired C75S CPU is in Lead before removing
power from the reserve/opposite CPU.
HC900 Control System Diagnostics
The CPU module performs diagnostic tests on all critical parts of the module like memory, processors,
address lines etc. When a critical fault is detected, the CPU will raise an alarm and reboot. If a non critical
fault is detected, the module will raise a warning and continue to function.
The I/O function blocks in Monitor Mode are used to determine the ‘Channel/Sensor Status’, output value
and state of the block ‘Fail’ Pins. In monitor mode, Designer provides overview information for the
Controller and Racks to check the behavior of the system. Communications Link status can also be found
in Designer monitor mode.
To confirm normal operation of the system before provoking a diagnostic, the following status indicators
should be in the status listed below:
Table 5 – Status Indicators
LED
Indicators:
Controller status LED is green and blinking with the scan.
Scanner status LED is green and blinking with the scan.
Module status LED is green and blinking with the scan
Function
Block
Monitors:
Analog System Monitor: HWOK is ‘ON’.
Fast System Monitor: HWOK is ‘ON’.
All Rack Monitors: Rack OK Pin are ‘ON’ for those present.
All Rack Hi Temp and Module Fail Pins are ‘OFF’
All channels are operating normally.
HCD
Monitor:
Controller Diagnostic Summary: = ‘GOOD’
All communication ports are GOOD, and operating without errors
Rack 1 Status: ‘GOOD’.
All Rack Modules physical type matches the configuration type and meets the
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