Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 104)

Communications 7-5
1503-UM054C-EN-P – June 2013
Hold State
In general when the hold state option is selected the unit will
continue to function based on the last known state of the network
commands. This will require the unit to function slightly differently
dependent on the logic mask selected, and the number of IntelliVAC
MC units which are connected.
Mask Network
Logic mask 1 is considered a direct command mask; this means that
the commands are acted upon directly without the use of
DeviceLogix. If the Hold state option is selected as well as logic
mask 1 all contactors will simply retain their current state until a
connection is re-established and a command is given to change their
state. Only 1 IB option has this mask.
Note:
In logic mask 1 a “Net Start” command will be considered an
“energize IB-OUTA” command and a “net stop” command
will either be considered a “de-energize IB-OUTA”
(electrically held contactor) or a “energize IB-OUTB”
(mechanically latched contactor)
Mask DeviceLogix
Logic mask 2 requires the functionality of DeviceLogix in order to
create direct commands to the contactor(s). As such, it is possible
that when communication is lost, that the DeviceLogix code may be
in the process of executing a sequence of timed commands. If this
occurs the IntelliVAC Plus will assume all network inputs to be
unchanged and continue to execute the DeviceLogix logic. It is
important that if a network command is required in the logic for a
critical event, (one that could cause damage if not executed in a
certain time frame, i.e. the transition of an autotransformer which is
only rated to carry current for 15 seconds) that sufficient logic be
built into the DeviceLogix logic such that if a command is not
received within the critical time the logic will abort the start
sequence.
Reset State
If the RESET STATE option is selected and the selected logic mask
is 1, or 2 the IE will reset all outputs to the OFF (0) state and wait
until a network connection is established, at which point it will begin
executing logic as if power had been cycled on the IE unit.