Omron Register Block Tag

Introduction

The Omron Register Block Tag read a region of Omron PLC memory.

Configuration Properties

The Omron Register Block Tag supports the configuration properties of the Word Register Block Tag plus these properties:

Property	Type	Version	Description
ScanInterval	TIME	1.0	The interval between each scan. See Interval and Offset for information on how timed activities are scheduled.
ScanOffset	TIME	1.0	The offset added to the ScanInterval to get the actual scan time. See Interval and Offset for information on how timed activities are scheduled.
Device	Reference	1.0	The Omron PLC Device where the register block is located.
MemoryAddress	STRING	1.8	The memory address of the first word of the register block. See Omron PLC Data Address for information on how this field is formatted. Click the Browse button to access the memory address editor.
WordCount	UINT	1.0	The number of words to read.

WordCount Property

The Omron protocol defines maximum limits for the number of words that can be read in a single read request. When the WordCount property exceeds these limits, the driver will use multiple read requests to read the data. The maximum number of words the driver will read in a single read request depends on the protocol used:

Protocol	Maximum Size of Each Read
Host Link	30 words
FINS over Host Link	64 words
FINS over UDP	269 words
FINS over TCP	269 words

For example, a register block of 10,000 words would require:

334 read requests when using Host Link.
38 read requests using FINS over UDP.

Tag Commands

The Omron Register Block Tag supports these tag commands:

Tag Command	Version	Description
Refresh	1.0	Requests an immediate read of the data from the PLC.

Note: Event triggered data reads (from the Refresh Tag Command) and periodic data reads (defined by the ScanInterval property) are independent. You can use the Refresh Tag Command, or the ScanInterval property, or both to determine when the data is read from the PLC.

Relationships to Other Tag Types

The Omron Register Block Tag builds on the features of these tag types:

Further Information

Interval and Offset

To learn how activities are scheduled using Interval and Offset.

Omron PLC Data Address

To learn how to choose a data location in an Omron PLC.

I/O Analog Data Point Tag

To learn about the I/O Analog Data Point Tag that can be associated with the Omron Register Block Tag.

I/O Digital Data Point Tag

To learn about the I/O Digital Data Point Tag that can be associated with the Omron Register Block Tag.

I/O Word Data Point Tag

To learn about the I/O Word Data Point Tag that can be associated with the Omron Register Block Tag.

I/O Double Word Data Point Tag

To learn about the I/O Double Word Data Point Tag that can be associated with the Omron Register Block Tag.

Omron Driver

For an overview of the Omron Driver.

Word Register Block Tag

To learn about properties common to all Word Register Block Tags.

Glossary

For the meaning of terms used in Fernhill SCADA.