Delta RMC151 - Manual (Page 316)

RMC70/150 and RMCTools User Manual
Reducing the Program Size
The RMCs have the following amount of memory allocated for the entire Programming
node which includes the user programs, Program Triggers, and plot templates. Notice that
the Tuning Wizard borrows about 8KB when it needs to run. Therefore, if a controller has
less than 8KB of free program memory, the Tuning Wizard may not be able to download
its program.
CPU Firmware
Program
Memory Size
Approximate
Capacity in Steps
RMC75E
(1.1G or newer)
3.40.0+ 496KB 1000-2000
3.32.0-3.39.4 240KB 500-1000
2.03-3.31.3 112KB 300-500
1.00-2.02 64KB 150-250
RMC75E
(1.1F or older)
3.32.0+ 240KB 500-1000
2.03-3.31.3 112KB 300-500
1.00-2.02 64KB 150-250
RMC75P All 64KB 150-250
RMC75S All 64KB 150-250
RMC150E 3.40.0+ 496KB 1000-2000
Pre-3.40.0 240KB 500-1000
If the user programs exceed the amount of memory available, it means that you simply
have too much programming. You may be able to slightly reduce the size by disabling
expression logging as described below, but you may need to reduce the amount of
programming.
Tips for Reducing the Programming Size
If you have disabled expression logging and your program image is still too large, you
must reduce the amount of programming. Here are some tips:
• Offload to the PLC
If your machine has a master controller, such as a PLC, offload some of the
programming to it.
• Use Arrays
If you are performing many consecutive similar steps, consider using arrays and loops
instead.
• Disable Expression Assignment Logging
By default, the RMC logs the results of assignment expressions and COPY statements
in the Expression (113) command. If your programs use this command, you may be
able to decrease the program size by disabling expression logging. You can still log the
results of certain calculations by using the LOG_EVENT function.
To disable the expression logging, in the Programming Properties dialog, on the Verify
page, uncheck Log Expression Statements.
Reducing the Time Usage
RMCTools calculates the worst-case scenario of how much time of any control loop may
be taken up by program calculations, which includes the user programs and the Program
Triggers. Each task can process one step per loop, and conceivably, a step can be run on
more than one task simultaneously. RMCTools finds the steps that take the longest to
process, and multiplies that time by the number of tasks the step could possibly run on.
The time allocated for the user programs varies with RMC as described in the Time
Allocation section below.
296 Delta Computer Systems, Inc.