Features And Guidelines; Front Panel Indicators; Status Indicator Operation - Honeywell HPM Service

2 Equipment Description
2.12 I/O Link Extender (Fiber Optic Link)

Features and guidelines


Each I/O Link Extender consists of two I/O Link Extender cards, one for Link A and one for Link B,
which occupy two slots in the HPMM or IOP card file.

Each Standard I/O Link Extender card has an associated fiber Optical Coupler Module that can drive
up to three pair of fiber optic cables. Each cable pair is terminated by a fiber Optical Coupler
Module that terminates one fiber optic pair.

Each Long Distance I/O Link Extender card has an associated Fiber Coupler that drives a single pair
of fiber optic cables. Each cable pair is terminated by a fiber Optical Coupler Module that terminates
one fiber optic pair.

Every remote card file, or complex of IOP card files, requires two I/O Link Extender cards and two
fiber Optical Coupler Modules, one for Link A and one for Link B. The Standard I/O Link Extender
card will drive and terminate Link A or Link B, depending upon the card file number and card file
slot number. If the card file number and card file's slot number are both odd or both even, the card
will drive Link A. If the card file number and card file's slot number are not both odd or both even,
the card will drive Link B. The Link A or Link B selection for the Long Distance I/O Link Extender
is determined by a jumper on the card.

Two Standard I/O Link Extender cards, connecting up to six remote card files, can be installed in a
HPMM card file, but the maximum number of other primary IOPs is still 40 (plus 40 redundant
IOPs).

The maximum fiber optic cable length is dependent upon the number of splices and quality of the
cable (dB loss per meter of cable). This maximum can be between 0.98 and 1.3 kilometers for the
Standard I/O Link Extender and 8 kilometers for the Long Distance I/O Link Extender. See the
High-Performance Process Manager Planning manual for the Loss Budget calculation.

Front panel indicators

Two visual front panel indicators are provided on the I/O Link Extender card that are consistent with the
display of IOP card indicators. The upper indicator is illuminated if the fused +24 Vdc is present on the
card (the input voltage is acceptable). The lower indicator denotes status.

Status indicator operation

In normal operation, the lower indicator is illuminated when messages are being transmitted from the
fiber optic cable. The indicator should be fully lit or slightly flickering, depending on system loading.
Abnormal operation will result in the anti-jabber circuit locking up the transmitter circuit when the
transmission period has been too long. The indicator will then be extinguished. If the fiber Optical
Coupler Module is improperly installed, the indicator will blink at a 50% duty cycle. The anti-jabber
circuit can be reset by cycling the upper extractor/insertion lever power switch on the I/O Link Extender
card. For the Long Distance I/O Link Extender, cycling power resets both ends of the link. The Standard
I/O Link Extender must be manually reset at both ends of the link. The Long Distance I/O Link Extender
can be reset by cycling power at one end of the link.
70 HPM High-Performance Process Manager Service
Honeywell
R688
December 2020