Honeywell EXCEL 5000 OPEN SYSTEM XFL521B Product Data page 21

Applying CARE Printout Labels
Figure 24. XAL1 swivel label holder.
Normally, CARE labels can be used on electronics modules.
When using electronics modules with manual override units,
CARE labels cannot be applied to the face of the manual
override unit. In this case, the XAL1 swivel label holder is re-
quired (package of 10). The XAL1 swivel label holder is
mounted to the terminal block as shown in Figure 24.
Removing Modules and Terminal Blocks
The electronics modules and terminal blocks can be removed
by carrying out the following steps:
1. Unlock the safety latch(es) as is depicted in Figure 25.
on terminal blocks
Figure 25. Unlocking the safety latches.
2. Remove the electronics module from the terminal block (or
manual terminal disconnect module) by pushing a screw-
driver between the electronics module and the spring clip
on the terminal block (or manual terminal disconnect
module).
Figure 26. Unlocking the module spring clip.
3. Unlock the spring clip by lightly bending upwards with the
screwdriver.
4. Unplug the electronics module.
5. When installed, dismount the manual terminal disconnect
module as is described for the electronics module.
on XSL512
6. Disconnect the power to the connector module before
removing the terminal block.
Figure 27. Releasing the sliding bus link.
7. Now release the sliding bus link with a screwdriver and
push the sliding bus link to the right into its terminal block.
Make sure that it is drawn back completely!
NOTE: Do not dismount the terminal block until both sliding
bus links are drawn back completely.
8. The sliding bus link of the terminal block to the right (if one
exists) can be released without removing the electronics
module by pushing a screwdriver into one of the notches
of the sliding bus link and sliding it backwards into its
home position (terminal block) with small sideways move-
ments.
Figure 28. Removing the terminal block.
9. Lift the terminal block from the rail by inserting a screw-
driver tip into the two mounting feet - one after the other -
and lifting up the terminal block with small levering move-
ments.
L W Network Interface
ON ORKS
Distributed I/O modules contain an FTT-10A Free Topology
Twisted Pair Transceiver allowing communication with other
devices on a L W
ON ORKS
communicate at 78 Kbaud and provide transformer isolation
so that the bus wiring does not have a polarity; that is, it is
not important which of the two bus terminals are connected
to each wire of the twisted pair.
FTT devices can be wired in daisy chain, star, loop or any
combination thereof as long as the maximum wire length re-
quirements given below are met. The recommended con-
figuration is a daisy chain with two bus terminations. This
layout allows for maximum bus length, and its simple struc-
ture presents the least number of possible problems, par-
ticularly when adding on to an existing bus.
NOTE: A doubly-terminated bus may have stubs of up to
10 ft (3 m) from the bus to each node.
21
DISTRIBUTED I/O
network. FTT-10A transceivers
EN0B-0090