Delta RMC151 - Manual (Page 300)

RMC70/150 and RMCTools User Manual
See the Program Triggers topic for details.
Variables
Variables make the User Programs very flexible. Variables can be used to effortlessly
change programs, make programs readable, and easily influence User Programs via a
PLC. Variables may be used in command parameters, the Expression (113) command,
and several Link Types.
Variables can be individually selected to be retentive. The Current Value of retentive
variables will be retained between power cycles without requiring a Flash update. This is
useful for retaining data such as setpoint positions, machine cycle counters, and recipe
data.
Retentive variables are only available on the RMC75E (version 1.4A or newer) and the
RMC150E and require firmware 3.30.0 or newer.
See the Variables topic for details.
Discrete I/O
The discrete I/O on the RMC can be used to control the programming, and the
programming can control the discrete I/O. See the Discrete I/O topic for details.
Programming from External Systems
The RMC can be controlled from a PLC or other host controller. It can be done in the
following ways:
Entirely with a PLC
A PLC can exercise complete control over the RMC by issuing commands to it. The RMC
supports many communication protocols, such as DF1, Modus/RTU and PROFIBUS.
With the RMC and PLC (or HMI)
The RMC can be programmed using a combination of a host PLC (or HMI) and User
Programs. This allows fast and time-critical sequences to be implemented in the User
Program (which executes at the RMC loop time), while less time critical functions are
handled via the PLC.
For details on using the RMC with an HMI, see the Communicating with HMIs topic.
Program Size and Time
See the Program Capacity and Time Usage topic for details.
5.2. Issuing Commands to the RMC
The commands are the building blocks of RMC programming. Commands tell the RMC what to
do. For a list of commands, see the Command List topic. There are several methods of sending
commands to the RMC:
Issuing Commands from RMCTools
When you are setting up, tuning, programming and troubleshooting the RMC, use the
Command Tool in RMCTools to issue commands to the RMC. See the Command Tool topic
for details on issuing commands from RMCTools.
For Shortcut commands, see the Shortcut Commands topic.
Issuing Commands from within a User Program
User Programs carry out complex sequences of commands on the RMC without requiring
intervention from a PLC or other controller.
280 Delta Computer Systems, Inc.