Parker Vansco VMM1210, User Manual, Page: 23 / 80

User Guide 13
Inputs
3.1.2. Power Control Digital Inputs
Any of the programmable digital inputs, INPUT1_D through INPUT8_D, may be
configured as power control inputs.
Power control inputs generate an internal signal in the module allowing it to
“wake up” and turn on its main internal power supply. This wakes up the main
processor and allows ladder logic to process.
 If no power control inputs are selected in software, the VMM1210 “wakes up”
as soon as power is applied to the unit.

By default, ladder logic files define INPUT1 as Master Power. If Master
Power is active, the VMM assumes that all other VMMs are active in the
system. It then performs Plug and Play functions as well as network fault
functions based on the assumption that all modules are awake.

A VMM that is blank will enable the Master Power signal so that it will
perform Plug and Play at power up.

It is possible to define the Master Power input in ladder logic. Review the
VMMS Help for details on this.
If you want plug-and-play and network fault-detection functionality, you must
ensure that the input defined as MASTER POWER (INPUT1 by default) is given
power control functionality on each module.
At least one input on each module should be dedicated as power control.
3.1.2.1. Power Control Inputs Configuration
Power control inputs can be programmed as active high or active low. If an input
is programmed as power control and active low, you need a low (ground) signal
on that input pin to wake up the module. If an input is programmed as power
control and active high, you need a high (battery) signal on that input pin to wake
up the module. If you change the active state of that input in ladder logic and
download this change to the module, the signal connected to that input pin must
also change states in order to wake up the module again via that input.