Chapter 8 Device Access; Data To Be Specified In Commands; Devices - Mitsubishi Electric MELSEC IQ-R series Reference Manual

8
DEVICE ACCESS
This chapter explains the commands to read and write devices.
8.1

Data to be Specified in Commands

This section explains the contents and specification methods for data items which are set in each command related to device
access.

Devices

Specify the device to be accessed by a device code and a device number.
• The data order differs between ASCII code or binary code.
• The data size to be set differs between MELSEC-Q/L series subcommands (subcommand: 0000, 0001) and MELSEC iQ-R
series subcommands (subcommand: 0002, 0003).
Subcommand type
For MELSEC-Q/L series
For MELSEC iQ-R series
When accessing any of the following devices, use the device extension specification (subcommand: 008).
• Link direct device
• Module access device
• CPU buffer memory access device
For the message format for device extension specification, refer to the following section.
Page 438 Read/Write by Device Extension Specification
ASCII code
Device
Device number
code
(2 digits) (6 digits)
Device code Device number
(4 digits) (8 digits)
Binary code
Device Device
number
code
(3 bytes) (1 byte)
Device number Device code
(4 bytes) (2 bytes)
8 DEVICE ACCESS
8.1 Data to be Specified in Commands
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