M-system 47D Series, Reference Manual

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1 47D Series Modbus Reference Guide EM-9501-C Rev.4
47D Series Digital Panel Meters
Modbus Protocol Reference Guide
CONTENTS
1. INTRODUCTION ...................................................................................2
2. MODBUS PROTOCOL ..........................................................................3
2.1 GENERAL DESCRIPTIONS ..............................................................................................3
2.2 TRANSMISSION SETTING ................................................................................................3
2.3 SYSTEM CONFIGURATION EXAMPLES ..........................................................................4
2.4 MODBUS MESSAGE FRAMING ........................................................................................6
2.4.1 READ HOLDING REGISTERS ...............................................................................6
2.4.2 WRITE MULTIPLE REGISTERS .............................................................................7
2.4.3 CRC CALCULATION ALGORITHM .........................................................................8
3. MODBUS REGISTERS .........................................................................9
3.1 DEVICE INFORMATION ....................................................................................................9
3.2 I/O DATA ........................................................................................................................... 10
3.3 DEVICE CONTROL .......................................................................................................... 11
3.4 LOCKOUT SETTING ........................................................................................................ 11
3.5 INPUT SETTING ..............................................................................................................12
3.5.1 COMMON SETTING .............................................................................................12
3.5.2 FORCED ZERO, TARE ADJUSTMENT
V M AC
.................................................12
3.5.3 DC VOLTAGE/CURRENT INPUT V ....................................................................13
3.5.4 POTENTIOMETER INPUT M .............................................................................13
3.5.5 RTD INPUT R .....................................................................................................14
3.5.6 THERMOCOUPLE INPUT
T
...............................................................................14
3.5.7 AC VOLTAGE/CURRENT INPUT V ....................................................................15
3.6 BARGRAPH SETTING .....................................................................................................16
3.7 ANALOG OUTPUT SETTING ..........................................................................................16
3.8 ALARM SETTING .............................................................................................................17
3.8.1 COMMON SETTING .............................................................................................17
3.8.2 SETPOINTS & BANK SWITCHING ......................................................................18
3.8.3 ALARM TRIP ACTION...........................................................................................19
3.9 OPERATION CONTROL SETTING ..................................................................................19
3.10 DISPLAY SETTING ..........................................................................................................20
3.11 MODBUS SETTING .........................................................................................................20