Honeywell EXCEL 5000 OPEN SYSTEM XFL521B Product Data page 18

DISTRIBUTED I/O
Coding the Terminal Block
Figure 12. Coding comb patterns.
The terminal block is coded with pins to prevent mixing the
module types during commissioning or servicing.
EN0B-0090
CAUTION
Mixing the modules can destroy them.
Coding the terminal block is achieved by inserting pins into
designated location holes on the terminal block in the base.
This codes the electronics modules to their respective
terminal blocks.
1. Break off the coding pins on the coding comb such that
the comb is left with the coding combinations shown in
Figure 12.
2. The comb side corresponding to the respective terminal
block is inserted into the location holes in the terminal
block and broken off (positions 1 to 9 are printed on the
circuit board of the terminal block for alignment).
Figure 13. Inserting coding comb into terminal block.
3. Next, the other side of the comb is inserted into the elec-
tronics module location holes and likewise broken off. If
one or more opposing location holes both contain pins,
then the module cannot be mounted onto the terminal
block. The module can be mounted only if the single
coding pin corresponds to the missing pin in the terminal
block.
Figure 14. Inserting coding comb into I/O module.
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