RMC Register Map (Automationdirect.com)

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 and written over various communication types. This topic describes the mapping of a subset of those registers to Automationdirect.com DirectLogic 205/405 addresses. For the addresses of these registers for other communication methods such as Modbus Plus, PROFIBUS-DP, and other Ethernet protocols, see the following topics:

• RMC Register Map (Allen-Bradley)

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

• RMC Register Map (Omron FINS)

• RMC Register Map (Siemens TI505)

• RMC Register Map (Siemens S7)

• RMC Register Map (Modbus Plus)

• RMC Register Map (PROFIBUS-DP Message Mode)

The various Automationdirect.com DL205/405 PLCs have different ranges of V-memory that can be accessed via the Ethernet. The Ethernet-capable DL205/405 PLCs only support between 1280 and 15616 V-memory words and therefore cannot access 64K registers. For each block of registers below, the DL205/405 PLC CPUs that support that block are listed under PLC Support.

Status Registers:

PLC Support: D2-240, D2-250, D4-430, D4-440, and D4-450

These registers can only be read; writes are ignored.

Note: V0-V177 may be displayed as TA0-TA177, called aliases. You can disable displaying aliases by selecting the View menu in DirectSOFT32, Options menu item, Global tab, and clearing the Display Aliases checkbox.

Command Registers:

PLC Support: D2-240, D2-250, D4-430, D4-440, and D4-450

These registers can be read or written.

Note: V0-V177 may be displayed as TA0-TA177, called aliases. You can disable displaying aliases by selecting the View menu in DirectSOFT32, Options menu item, Global tab, and clearing the Display Aliases checkbox.

Parameter Registers:

PLC Support: D2-240, D2-250, D4-430, D4-440, and D4-450

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

Note: V1000-V1177 may be displayed as CTA0-CTA177, called aliases. You can disable displaying aliases by selecting the View menu in DirectSOFT32, Options menu item, Global tab, and clearing the Display Aliases checkbox.

Event Step Table Registers:

PLC Support: D2-250, D4-430, D4-440, and D4-450: Full 256-step table
D2-240: Only the first 160 steps (up to V4377)

These registers can be read or written.

Note: In the table below, the form V2000+n*10 is used. The 10 is also octal. Therefore, the last digit will always be the same for a given field on every step. For example, the Mode word is V2000 for step 0, V2010 for step 1, V2020 for step 2, and so on up to V5770 for step 255.

The register map for addressing the fields in the event step table is as follows:

Input to Event Table Registers:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

These registers can be read or written.

Status Map Registers:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

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

Plot Type Registers:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

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:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

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 bit numbers listed in the table below are in RMC format (0 is LSB, 15 is MSB):

Plot Time Registers:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

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:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

Note: To use these registers, 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:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

Note: To use these registers, 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:

PLC Support: D2-250, D4-430, D4-440, and D4-450 (D2-240 excluded)

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

Spline Download Area:

PLC Support: D2-250, D4-440, and D4-450 (D2-240 and D4-430 excluded)

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 and Set Spline Interval/End Segment commands. For details on using this Spline Download Area, see Downloading Splines to the RMC.

Plot Registers:

Due to the limited addressing supported by the Automationdirect.com DirectLogic 205/405 PLCs, plots cannot be read through the Ethernet.

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