Appendix
BC-200 Manual
– P/N DOC-01-013
117
Connecting LCM with LEM
9.6.4.1
L
OOP WIRING STYLES
:
Loops may be operated one of several modes – style 4, style 6 as well as style 7 (refer to diagrams below). Style
4 is an open loop arrangement while styles 6 and 7 are closed loop arrangements. Refer to section 0 for loop
configuration details and to section 9.4.2 for cabling requirements.
Style 4. (Open loop – does not return to the panel, non-redundant)
Port A (Channel A) 3810m maximum, 50 Ω resistance maximum.
Port B (Channel B) 3810m maximum, 50 Ω resistance maximum.
In style 4, the processor will poll both legs of the “loop” simultaneously through its own driver. If either leg is
shorted (wire-wire), the other leg is not degraded since it is operated from a separate driver.
Style 6. (Closed loop – returns to panel providing a redundant path for open circuit conditions)
Total Loop, 3810m maximum, 50 Ω resistance maximum.
In style 6, the processor polls the loop from one of the drivers (the B-side). If a failure (open circuit) is detected, it
will poll through both ends.
Style 7. (Closed loop with isolation modules providing a redundant path for short circuit conditions)
Total Loop, 3810m maximum, 50 Ω resistance maximum.
Maximum of 25 devices between isolation modules (Note: refer to install manual for more details)
In style 7, the processor polls the loop from one of the drivers (the B-side). If a failure (short circuit) occurs
between two isolation modules or the A or B ports of the LCM and an isolation module, the shorted section of loop
will be isolated and the processor will poll through both ends. Note that the A and B ports of the LCM also provide
short circuit isolation.
Summary of Contents for BC-200
Page 1: ...BC 200 OPERATION INSTALLATION PROGRAMMING MANUAL P N DOC 01 013 ECN11 0058 23 Aug 12 Rev 5 07 ...
Page 138: ...Appendix BC 200 Manual P N DOC 01 013 138 9 12 PANEL EXPANSION RELAYS ...
Page 142: ...Appendix BC 200 Manual P N DOC 01 013 142 9 9 1 13 3 4 4 R RE EL LA AY Y M MO OD DU UL LE E ...
Page 144: ...Appendix BC 200 Manual P N DOC 01 013 144 9 9 1 13 3 6 6 Z ZO ON NE E M MO OD DU UL LE E ...
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