Modbus Read, Write and Override Parameters plus Exception Codes
8/05 UDC2500 Universal Digital Limit ControllerProduct Manual 97
10 Modbus Read, Write and Override Parameters plus
Exception Codes
10.1 Overview
Introduction
This section contains information concerning Reading, Writing, and Overriding
parameters in this instrument. There are two types of parameters:
•
Data Transfer—These parameters include reading control data, option status, and
reading or changing setpoints.
•
Configuration Data—All the configuration data is listed in the order in which it
appears in the controller.
Each type of parameter has the identifying codes listed with it.
What's in this section?
The following topics are covered in this section.
TOPIC See Page
10.1 Overview 97
10.2 Reading Control Data 99
10.3 Miscellaneous Read Onlys 99
10.4 Configuration Parameters 100
10.5 Modbus RTU Exception Codes 109
General Information
Non-volatile Memory Retention
• This controller uses non-volatile memory to store configuration data. These
memories are guaranteed to retain data for a minimum of ten years as long as the data
is not written and erased more than 10,000 times. In order not to exceed this number,
it is strongly recommended that configurations which change rapidly such as
Computer Setpoint use the Override feature which does not affect non-volatile
memory.
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