Command: Read Register (111)

Supported Axes:	All
Supported Controllers:	RMC75/150

See the Commands Overview topic for basic command information and how to issue commands from PLCs, HMIs, etc.

Command Parameters

#	Parameter Description	Range
1	Address Note: See Specifying a Register Address below.	unsigned integer

Parameter Description

Range

Address

Note: See Specifying a Register Address below.

unsigned integer

Description

Note: Delta does not recommend using this command. PLCs can read any register directly without needing to send this command. In a user program, use the Expression (113) command to directly access registers.

This command copies the register pointed to by the Address into the axis' Read Response register.

Specifying a Register Address

When issuing this command from anywhere other than RMCTools, the addresses in the Address command parameter must be entered as an integer value.

RMC addresses are represented in IEC format as:

%MDfile.element, where file = file number, and element = element number.

Use the following equation to convert a register address to integer format, N:

N = file * 4096 + element

Example:

Why Bother?

This command is used with certain communication types. If the communications is set up to continuously return the Read Response register, then issuing this command will allow you to read whatever register you want. This is a good way of accessing more registers for communication types that are set up to only return certain registers.