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4.4 Watlow MicroDIN

Input

Calibration Offset

Calibration offset allows a device to compensate for an inaccurate sensor, lead

resistance or other factors that affect the input value. A positive offset increases

the input value, and a negative offset decreases the input value.

The input offset value can be viewed or changed with Calibration Offset (Input

Group).

Figure 4.4 — Calibration Offset

Features



Time

Temperature

Temperature Reading 

from Sensor

Actual Process Temperature

Negative Calibration Offset will

compensate for the difference

between the Sensor Reading and

the Actual Temperature.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 105 106

MICRODIN 1
User’s Manual 1
Addendum 2
Declaration of Conformity 3
Meet the MicroDIN Team 4
Safety Information 5
Technical Assistance 5
Your Feedback 5
Table of Contents 6
Chapter One: 7
Setup Steps 9
Indicator Lights 9
Overview 10
Chapter Two: 11
Communications Setup 11
Communications Overview 12
EIA-485 Network 13
Communication 14
MicroDIN, A Modbus 15
Remote Terminal Unit (RTU) 15
Modbus Register Numbers 16
Set Address/Baud Rate 17
C D D C 18
8 None 1 1 19
Chapter Three: 21
Installation and Wiring 21
Introduction 22
Mounting the MicroDIN 23
Figure 3.3 23
Install and Wire 24
To Mount MicroDIN 24
To Dismount MicroDIN 24
Input Wiring 26
Output and Power Wiring 27
Communications Wiring 28
Wiring Examples 30
Chapter Four: 33
Features 33
The System 34
Power Limit 35
Calibration Offset 36
Filter Time Constant 37
Sensor Selection 38
Range Low and Range High 38
Control Methods 39
Proportional Control 40
Alarm Set Points 43
Alarm Hysteresis 43
Process or Deviation Alarms 44
Alarm Latching 44
Alarm Silencing 45
Panel Indicator Lights 46
Open Loop Detect 46
Bumpless Transfer 47
Chapter Five 49
Learn the Parameters 49
System Group 50
System Group continued 51
Input Group 52
Input Group continued 53
Control Output Group 56
Parameters 57
Power Limit Set Point 57
High Side Power 57
Low Side Power 58
Fixed Manual Output 58
Operation Group 59
Operation Group continued 60
PID Group 61
PID Group continued 62
Alarm Output Group continued 66
Error Group continued 70
Characteristics Group 73
Serial Number 2 74
Software ID Number 74
Software Revision 74
Diagnostics Group continued 75
Calibration Group continued 78
Chapter Six: 81
Operation and Calibration 81
MicroDIN Startup 82
MicroDIN Shutdown 83
Operations 84
• See p. 5.6 85
Equipment Required 86
Setup and calibration 86
Appendix 87
Writing a Modbus Application 88
Packet Syntax 88
Loop Back Command (0x08) 91
Exception Responses 92
Glossary 94
Output #1: User selectable 99
Output #2: User selectable 99
A.14 Watlow MicroDIN 100
Ordering Information 101
4.4, 5.6 102
Watlow MicroDIN A.17 103
Parameter Index 104
Statement: 106
Quality and 106

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Watlow MICRODIN Manuale Utente Pagina 36

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