Rockwell Automation 1336 3-20HP FRN 1.01-3.01 - Manual (Page 102)

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Appendix
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Logic Interface Options
1336ĆMODĆL1
The Contact Closure Interface Board provides a means of interfacing
+5V DC TTL Logic Contact
various signals and commands to the 1336 drive by using contact closures.
Closure Interface Board
The board is self-powered and does not require a separate user power
source. Plug in connectors on the Interface Board allow it to be plugged
directly into connectors on the Main Control Board. Two mounting thumb
screws secure the board in place.
!
ATTENTION: If the Contact Closure Interface Board is to
replace either the 1336-MOD-L2 or 1336-MOD-L3, external
circuits must be reconfigured to operate at the +5V DC logic
potentials supplied by the board. The application of either +24V
DC or 115V AC to the Contact Closure Interface Board will
damage both the Interface Board and the Main Control Board.
Operation
Each of the twelve terminals on the board are defined as being either a user
command input signal or interface common.
When an open circuit is present between a terminal and interface common,
a +5V DC potential will exist. This represents the not selected state or high
= False.
When a closed circuit is present between a terminal and interface common,
the input will go low to approximately zero volts or true. When the input
signal is pulled low to interface common, a sinking current of 15-20mA
will flow.
Requirements
Circuits used with the Contact Closure Interface Board must meet the
following criteria:
•
Circuits must be capable of operating with low = True logic.
•
In the low state, external circuits must be capable of a sinking current of
approximately 20mA to pull the terminal voltage to 0.4V DC or less.
•
In the high state, external circuits must allow the terminal voltage to rise
to a voltage of 2.5-5V DC.