RMC Register Map (Omron FINS)

Tip: RMCWin's Address Tool provides an easy way to identify addresses in the RMC. Simply open the Address Tool and then move the cursor to any field in RMCWin that represents an RMC Register, and the Address Tool will display the address in the address format of your choice. See Address Tool for details.

The RMC module has 64K (65536) 16-bit registers that can be read from or written to over Ethernet, Modbus Plus, and PROFIBUS-DP. Each register is assigned an address. However, under the different communication methods, different addressing schemes are used. This topic describes the addressing over Omron's FINS protocol, as used by the Omron CS1 and CV PLCs. For details on addressing from other modules refer to the following topics:

• RMC Register Map (Allen-Bradley)

• RMC Register Map (Automationdirect.com)

• RMC Register Map (Modbus/TCP and Modbus/RTU)

• RMC Register Map (Siemens TI505)

• RMC Register Map (Siemens S7)

• RMC Register Map (Modbus Plus)

• RMC Register Map (PROFIBUS-DP Message Mode)

The Omron CS1 and CV PLCs require the ETN01 Ethernet module in order to communicate with the RMC. For details on using this device, see Using Omron PLCs with the RMC ENET.

Other devices that communicate with FINS over Ethernet may also be able to communicate with the RMC.

Status Registers:

These registers can only be read; writes are ignored.

Command Registers:

These registers can be read or written.

Parameter Registers:

These registers can be read or written. Changes to these registers do not take effect until a Set Parameters (P) command is executed.

Event Step Table Registers:

These registers can be read or written.

Input to Event Table Registers:

These registers can be read or written.

Status Map Registers:

This block of registers is only used by the Modbus Plus and PROFIBUS interfaces. Therefore, these registers are unused by this Ethernet protocol.

Plot Type Registers:

The plot type registers can be read or written. The values that are read indicate the extra plot information in the current graph. The values written to these registers tell the controller which extra plot information to obtain on the next plot. For these registers, the following values are used:

• 0: Extra position precision

• 1: Command and Command Value

• 2: Event Step and Link Value

• 3: Raw Transducer Counts

• 4: Internal Target and Actual Speeds

• 5: Integral Drive

For more information on these four types of plot information, see Selecting the Data to Plot and Reading Plots from the Communication Module.

Digital (Discrete) I/O Registers:

These registers indicate the current state of the digital inputs and outputs. These registers may only be read; writes will be ignored, as this product does not support forcing inputs or outputs.

The Omron PLCs and the RMC use the same bit numbering. Therefore, bit numbers in the table below use 0 for the least-significant bit and 15 for the most-significant bit:

Plot Time Registers:

The Plot Time interval is configurable on the RMC. This interval indicates the number of control loops between each sample in a plot. Therefore, if the control loop is 0.976ms (e.g. RMC100-M1), this indicates roughly the number of milliseconds between samples. If the control loop is 1.953ms (e.g. RMC100-M4), this indicates half of the number of milliseconds between samples.

These registers may be read or written. When read, they indicate the plot interval of the currently gathered plot. When written, they set the plot interval the RMC should use for the next plot it will gather. When the RMC starts the next plot, it copies the requested plot interval into the currently used plot interval.

Last Parameter Error Registers:

Note: To use these registers through Ethernet, you must have RMC100 CPU control firmware dated 19990715 or later.

Each of these read-only registers holds the number of the last parameter error generated on an axis. This is useful for determining the cause of the Parameter Error bit in the status word. For a description of the values read from these registers, see Parameter Error Values.

Firmware Date Registers:

Note: To use these registers through Ethernet, you must have RMC100 CPU control firmware dated 19990715 or later.

These read-only registers hold information about the firmware versions in the RMC100 CPU module. The Boot and Loader firmware versions have no effect on the actual performance of the RMC and therefore can usually be ignored.

Reserved Registers:

Reading these values will return zero, and writes are ignored.

Spline Download Area:

These registers are write only. Reading them will return zero. This area is used to download intervals and points in a spline. This is a much more efficient alternative to using individual New Spline Point (X) and Set Spline Interval/End Segment (T) commands. For details on using this Spline Download Area, see Downloading Splines to the RMC.

Note: The Omron CV500 and CVM1-CPU01 PLCs are limited to addressing D0 to D8191, and therefore cannot use the Spline Download Area.

Plot Registers:

These registers can only be read; writes are ignored.

Note: Reading plots is not a trivial task; for further details, see Reading Plots from the Communication Module.

Note: Omron PLCs can only access as many Extended Data Memory banks as they have. Therefore, many Omron PLCs will only be able to access a limited number of the banks listed above, or may not be able to access the plot registers at all.

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