Omron PLC Data Address

Introduction

Data in Omron PLC Devices is stored different locations depending on the intended use of the data. For example, there are separate locations for I/O, Timer Values, Data Registers and so on.

The Omron PLC Data Address is a string that defines the location of data in an Omron PLC. It consists of optional device type letters, followed by one or more decimal digits:

Device Type	Format	Notes
I/O	CIOnnnn[.bb] nnnn[.bb]	The CIO prefix is optional. nnnn represents the I/O word. bb represents an optional bit number.
Link Relay	LRnnn[.bb] Lnnn[.bb]	Used for a 1:1 link with another PLC
Holding Relay	HRnnnn[.bb] Hnnnn[.bb]	Value is retained when the power is turned off.
Data Memory	DMnnnn[.bb] Dnnnn[.bb]	Value is retained when the power is turned off.
Auxiliary Relay	ARnnnn[.bb] Annnn[.bb]
Timer Value	Tnnnn
Timer Flag	TSnnnn
Counter Value	Cnnnn
Counter Flag	CSnnnn
Expansion Data Memory	EMmm.nnnn[.bb] Emm.nnnn[.bb]	Only supported on the larger PLC Devices. mm represents the bank number

Note: The numbers in Omron PLC Data Addresses are zero-based.

Omron PLC Data Address Examples:

Address	Description
0	The first word of the I/O area, for a modular PLC this is usually the first inputs.
1.15	The most significant bit of the second word of the I/O area.
10	The 10th word of the I/O area, usually the first outputs on a CPM1(A) or CPM2A.
CIO10	Alternative way of selecting the 10th word of the I/O area.
DM0000	The first Data Memory word, usually a user defined location.
EM00.100	Word 100 in Extended Memory Bank 0.

Where Used

The Omron PLC Data Address is used in these contexts:

In the IOItemName property of an I/O Analog Data Point Tag when the tag is associated with an Omron PLC.
In the IOItemName property of a I/O Digital Data Point Tag when the tag is associated with an Omron PLC.
In the IOItemName property of a I/O Double Word Data Point Tag when the tag is associated with an Omron PLC.
In the IOItemName property of a I/O Word Data Point Tag when the tag is associated with an Omron PLC.
In the MemoryAddress property of an Omron Register Block.
In the DataAddress parameter of the DirectWriteBit Tag Command when used with an Omron PLC.
In the DataAddress parameter of the DirectWriteWord Tag Command when used with an Omron PLC.

Data Address Editor

The Data Address Editor provides a convenient tool to build Omron Data Address strings.

To open the Data Address Editor, click the Browse button of the IOItemName or MemoryAddress property:

Further Information

Omron Register Block Tag

To learn about Omron Register Block Tags.

Omron Driver

For an overview of the Omron Driver.

Glossary

For the meaning of terms used in Fernhill SCADA.