Modbus Read, Write and Override Parameters plus Exception Codes
3/07 UDC3500 Universal Digital Controller Product Manual 347
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 347
10.2 Reading Control Data 350
10.3 Read Options Status 351
10.4 Miscellaneous Read Onlys 352
10.5 Setpoints 353
10.6 Using a Computer Setpoint (Overriding Controller Setpoint) 355
10.7 Configuration Parameters 356
10.8 Modbus RTU Exception Codes 434
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 that change rapidly such as Computer
Setpoint use the Override feature, which does not affect non-volatile memory.
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