C-16
Appendix C Scanner
®
2000 microEFM
(BLOCK_ERR) parameter for possible causes.
Remember to check the mode of the resource block. If it is in OOS mode, all other blocks will automatically
be placed in OOS mode as well.
The block error parameter provides an overview of hardware and software erors. It is effective in tracing a
wide variety of errors including block conguration errors, link conguration errors, fault state forced, need
for maintenance, input/output/memory failure, and lost data.
If the error is dened as a block conguration error, check that all parameters in the block with an invalid
default value have been congured. Check that all limit parameters are within the range established by the
scaling parameter. Changing an engineering unit can cause a conguration error if it causes some values to go
out of range.
Resource State
Another good early checkpoint is in the resource block. The Resource State (RS_STATE) parameter shows
the status of the control strategy. If the Resource State is Failure, a memory failure or other hardware failure
has been detected.
Transducer Block Error
The transducer error (XD_ERROR) parameter reports errors that are unique to the Scanner 2000. It displays
only one error at a time, and when multiple errors are present, it displays only the highest priority errror. For
a list of common transducer errors, their descriptions, and tips for identifying the cause, see the
Foundation™
Fieldbus Protocol Manual for Scanner 2000.
Communication Faults
When a communication fault occurs, use the conguration tool to determine if it affects a single device or
the entire network. If a device fails to communicate, it will be removed from the live list displayed in the
conguration tool.
Common checkpoints include:
• Check continuity of connections. Measure resistances to eliminate a short circuit as the cause.
• Conrm voltage levels. If the supply voltage at the device is below 9 VDC, the device may not operate
normally. Possible causes may include
– voltage drop due to poor connections in junction boxes or at the device
– too many devices on a network
• Check for noise sources.
Maintenance
Instructions are provided below for replacement of the main board, eldbus interface board, or eldbus
module. For all other maintenance, see Section 5—Scanner 2000 Maintenance, page 77.
WARNING: Before servicing the Scanner 2000, disconnect all power sources/signal sources or
verify that the atmosphere is free of hazardous gases.
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