The Outputs - Emerson MultiFlex CUB-II Installation And Operation Manual

4.2. The Outputs

The MultiFlex CUB has eight relays that
energize and de-energize to control output loads.
When setting up an output on one of these re-
lays, you must make two important decisions:
1. Do you want an ON command from your
controller to mean "energize the relay" or
"de-energize the relay," and
2. When the relay is de-energized, as is the case
when the CUB goes offline or loses power,
do you want the contacts to be OPEN or
CLOSED?
HHT Contact
Display State
ON CLOSED
OFF OPEN
ON OPEN
OFF CLOSED
ON CLOSED
OFF OPEN
ON CLOSED
OFF OPEN
ON OPEN
OFF CLOSED
ON CLOSED
OFF OPEN
Table 4-2 - Output Board Fail-Safe and Switch Settings
The Outputs
Equipment
Fail Safe
State
ON ON
OFF
OFF OFF
ON
OFF OFF
ON
OFF ON
ON
ON OFF
OFF
ON OFF
OFF
Decision #1 is made by setting the fail-safe
switch. This is a bank of eight switches on the
plug-in output module. Each switch corresponds
to an output on the board (switch #1 = output #1,
etc.).
Decision #2 is made either by setting a fail-
safe jumper (for the MultiFlex CUB) or by wir-
ing the load to either the N.O. or N.C. terminals
on the Form C contact (for the MultiFlex
16I8O).
Table 4-2 shows how the fail-safe switch and
Form C contacts should be configured based on
how you want the output to perform during both
normal operation and during network/power
loss.
Set Failsafe Switch
To:
UP
UP
UP
DOWN
DOWN
DOWN
CUB Input and Output Setup • 11
Form C Contacts
Used:
N.C
N.O
N.C.
N.O
N.C
N.O