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position of the fail-safe switch. The fail-safe
switches for the outputs are on a switch bank at
the bottom right corner the plug-in output mod-
ule. Each switch corresponds to an output on the
board (switch #1 = output #1, etc.).
Table 4-1 and Table 4-2 show how the fail-
safe switch and Form C contacts should be con-
figured based on how you want the output to
perform during both normal operation and dur-
ing network/power loss.
State of Normally Closed (N.C.) Contacts
Fail-safe
Light
Switch
is ON
Up (ON)
Closed
Down (OFF)
Open
Table 4-1 - Output Board Fail-Safe and Switch Settings when Contact is Wired Normally Closed (N.C.)
State of Normally Open (N.O.) Contacts on
Fail-safe
Light
Switch
is ON
Up (ON)
Open
Down (OFF)
Closed
Table 4-2 - Output Board Fail-Safe and Switch Settings when Contact is Wired Normally Closed (N.O.)
4.2.2. Relay Output Ratings and Fuse
Protection
Each relay output on the MultiFlex Combi-
nation I/O boards is rated for up to 240 VAC
with a maximum current of 2 amps.
Each relay is fused with a 2A fast-blow 5mm
x 20mm fuse, Bussman GMA-2 or equivalent.
The Analog Outputs
on MultiFlex Relay Points
Loss of
Light
Communi
is OFF
cation
Open
Closed
Closed
Closed
MultiFlex Relay Points
Loss of
Light
Communi
is OFF
cation
Closed
Open
Open
Open
Note: There are not many cases where you
would want a relay to be OPEN when called to
be ON. For most applications, you will want to
set the fail-safe switch to UP so that an ON com-
mand from the controller will close the relay.
Loss of
Power
Closed
Closed
Loss of
Power
Open
Open
4.3. The Analog Outputs
All varieties of the MultiFlex board that have
an "AO" at the end of their model number
(88AO and 168AO) have four analog outputs
that can provide a variable 0V - +10VDC signal
to any of four variable-speed or variable-posi-
tion devices. The maximum output current for
each point is 10 milliamps.
I/O Board Input and Output Setup • 17
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