RMC75 CPU Modules Overview

A CPU module contains the processing unit, the communication channel such as serial, PROFIBUS, Ethernet, etc. and a monitor port or USB port for communications to the RMCTools software. The CPU module, together with an axis module attached to the front of the CPU Module, make up a complete motion controller, called a base module. Optional expansion modules can be added to the right of the motion controller.

The front panel of the CPU contains status LEDs and connectors for power and communications.

CPU Module	Description	RMCTools Monitor Port
RMC75E	Controller with Ethernet Communications	USB
RMC75S	Controller with Serial Communications	RS-232
RMC75P	Controller with PROFIBUS-DP Communications	RS-232

Comparing the RMC75 CPU Modules

In addition to the communication port and RMCTools monitor port, the RMC75 CPUs differ in the following ways:

Monitor Port Speeds
The RMC75E USB port provides a much faster connection to RMCTools, with much faster plot upload speeds, than does the serial port on the RMC75S and RMC75P.
Retentive Variables
The RMC75E variables can be set to retentive, meaning that the Current Value will be retained between power cycles without requiring a Flash update.
Memory Size
The 75E has significantly more memory for plots, programs, curves. See Plot Overview, Program Capacity and Time Usage and Curve Storage Capacity for details.
Loop Times
75E supports faster loop times.
Internal Processor
The RMC75S and RMC75P internal processors are 32-bit. The RMC75E has some 64-bit processing capabilities. In practice, the only difference the user will experience due to this is that some mathematical calculations will produce slightly different results.