Honeywell UDC 1000 Micro-Pro - RS485 Serial Communications (MODBUS); MODBUS Protocol Overview; MODBUS Message Formats and CRC16

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Contents5
Introduction11
Operator Mode13
Initial Displays14
Single Setpoint Operation14
Viewing/Adjusting the Setpoint/Setpoint Ramp Rate15
Dual Setpoint Operation15
Alarm Status Display16
Over-Range/Under-Range Displays16
Sensor Break Indication16
Manual Control Mode17
Pre-Tune Facility17
Self-Tune Facility18
Viewing the Hardware Definition Code18
Installation19
Unpacking Procedure19
Panel-Mounting the Controller19
Connections and Wiring21
Rear Terminal Connections21
Mains (Line) Input22
24V AC/DC Supply22
Thermocouple Cable Colour Codes23
Thermocouple Input24
RTD Inputs24
Linear Inputs24
Dual Setpoint Selection Input24
Relay Outputs25
SSR Drive Outputs25
DC Outputs25
Serial Communications Link25
Set up Mode27
Entry into Set up Mode27
Set up Mode Parameters27
Input Filter Time Constant30
Process Variable Offset30
Proportional Band & Deadband/Overlap31
Proportional Band 232
Reset32
Rate32
Overlap/Deadband32
Setpoint Low Limit33
Recorder Output Scale Maximum33
Recorder Output Scale Minimum33
Output Power Limit33
Output 2 Cycle Time34
Process High Alarm 1 Value34
Band Alarm 1 Value34
Deviation (High/Low) Alarm Value34
Loop Alarm Enable36
Loop Alarm Time37
Scale Range Decimal Point37
Scale Range Maximum37
Scale Range Minimum37
Manual Control Enable/Disable38
Setpoint Strategy38
Comunnications Enable/Disable38
Tuning the Controller Manually39
Controllers Fitted with Output 1 Only39
Process Variable40
Manual Tuning Parameters40
Self-Tune and Pre-Tune Facilities41
Exit from Set up Mode41
RS485 Connections43
Communications Enable/Disable43
Selection of Communications Channel Address43
Physical Requirements43
Communications Protocol44
Individual Parameters48
RS485 Serial Communications55
Read Coil Status56
Read Holding Registers56
Force Single Coil57
Preset Single Register57
Loopback Diagnostic Test57
Preset Multiple Registers58
Error and Exception Responses58
CRC16 Calculation59
Parameter Numbers61
Bit Parameters61
Word Parameters62
Configuration Mode65
Entry into Configuration Mode65
Hardware Definition Code66
Configuration Mode Parameters67
Input Range67
Communications Link Baud Rate72
Communications Address72
Cold Junction Compensation Enable/Disable72
Alarm Hysteresis Outputs73
Lock Code73
Internal Links and Switches75
Removing the Controller from Its Housing75
Removing/Replacing the Output 2/Output 3 Option Pcbs77
Removing/Replacing the RS485 Communications Option PCB or Dual Setpoint Selection Input Option PCB77
Replacing the Controller in Its Housing78
Selection of Input Type and Output 1 Type78
Product Selection Guide81
Product Specification87
Resistance Temperaeture Detector and DC MV88
Alphabetical Index101

Honeywell UDC 1000 Micro-Pro - RS485 Serial Communications (MODBUS); MODBUS Protocol Overview; MODBUS Message Formats and CRC16

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