Modbus Read, Write And Override Parameters Plus Exception Codes; Overview - Honeywell UDC3500 Product Manual

10 Modbus Read, Write and Override Parameters plus

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.
10.1 Overview
10.2 Reading Control Data
10.3 Read Options Status
10.4 Miscellaneous Read Onlys
10.5 Setpoints
10.6 Using a Computer Setpoint (Overriding Controller Setpoint)
10.7 Configuration Parameters
10.8 Modbus RTU Exception Codes
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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Modbus Read, Write and Override Parameters plus Exception Codes

Exception Codes
TOPIC
UDC3500 Universal Digital Controller Product Manual
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