Emerson 848L Resource Block, I/O Transducer and Logic Block Troubleshooting, NAMUR Sensors

Reference Manual

00809-0100-4696, Rev AA September 2004

TROUBLESHOOTING

FOUNDATION Fieldbus

Rosemount 848L

Symptom	Possible Cause	Corrective Action
Device does not show	Network configuration parameters	Set the network parameters of the LAS (host system) according to the FF
up in the live list	are incorrect	Communications Profile
		ST: 8
		MRD: 10
		DLPDU PhLO: 4
		MID: 7
		TSC: 4 (1 ms)
		T1: 1920000 (60 s)
		T2: 5760000 (180 s)
		T3: 480000 (15 s)
	Network address is not in polled	Set first Unpolled Node and Number of UnPolled Nodes so that the device
	range	address is within range
	Power to the device is below the	Increase the power to at least 9V
	9 VDC minimum
	Noise on the power /	Verify terminators and power conditioners are within specification
	communication is too high	Verify that the shield is properly terminated and not grounded at both ends. It is
		best to ground the shield at the power conditioner
Device that is acting as	LAS Scheduler was not	Ensure that all of the devices that are intended to be a Backup LAS are
a LAS does not send	downloaded to the Backup LAS	marked to receive the LAS schedule
out CD	device
All devices go off live	Live list must be reconstructed by	Current link setting and configured links settings are different. Set the current
list and then return	Backup LAS device	link setting equal to the configured settings.
Resource Block
Symptom	Possible Causes	Corrective Action
Mode will not leave	Target mode not set	Set target mode to something other than OOS.
OOS
	Memory Failure, Communication	BLOCK_ERR will show the lost NV Data or Lost Static Data bit set. Restart the
	Failure, Body Temperature	device by setting RESTART to Processor. If the block error does not clear, call
	Failure	the factory.
	No I/O Power	Ensure power at I/O Power Terminals are between 9-32 VDC.
Block Alarms Will not	Features	FEATURE_SEL does not have Alerts enabled. Enable the report bit.
work
	Notification	LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.
I/O Transducer and Logic Block Troubleshooting
Symptom	Possible Causes	Corrective Action
Mode will not leave	Target mode not set	Set target mode to something other than OOS.
OOS	Resource block	The actual mode of the Resource block is in OOS. See Resource Block
		Diagnostics for corrective action.
	i/O Transducer Block	The actual mode of the Transducer Block is OOS, set it to Auto
NAMUR Sensors
Symptom	Possible Causes	Corrective Action
I/O Failure	Open or shorted sensor	Check sensor and wiring

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