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18. Appendix I
18.2. Description
ATTENTION
If fieldbus devices connected to the Link do not appear as uncommissioned
device icons in the Link Folder, increase the Slot Time (LMLSTREC.ST)
value to 10. If an uncommissioned device does not appear, try increasing the
Slot Time value by one and cycling power to the FIM. Repeat this action, as
required.
Note that the Fieldbus profile specifies a Slot Time setting of 8. Some older
fieldbus devices may not meet the Fieldbus profile requirements. This means
that the default Slot Time setting of 8 must be changed to accommodate the
actual setting in the fieldbus device.
Tab
Main
Enable MAU
Loopback
(LOOPBACK)
552
Experion PKS Series A Fieldbus Interface Module User's Guide
Parameter
Default Value
Disabled
(No Check
mark)
Honeywell
Description
Determines whether or not the
Medium Attachment Unit (MAU)
Loopback function for the FIM is
enabled. A check mark in the
check box means that the
LOOPBACK function is enabled.
A blank check box means that
the LOOPBACK function is not
enabled. The default value is a
blank check box or the
LOOPBACK function is not
enabled.
When LOOPBACK is enabled, it
disables the final output stage of
the MAU transmit circuit,
connects the output of the
previous stage of the MAU
transmit circuit to the MAU
receive circuit, and disconnects
the MAU receive circuit from the
medium. The state of the
Loopback Enable shall not
change while the MAU is
transmitting or receiving.
This is a confirmation service of
local significance only, which
provides a device with the
facility to test the integrity and
functionality of the Physical
Layer circuitry, excluding the
July 2010
R400
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