Watlow MICRODIN Uživatelský manuál Strana 15
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- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Watlow MicroDIN 2.5
Communications
Setup
MicroDIN, A Modbus
™
Remote Terminal Unit (RTU)
RTU
The MicroDIN uses Modbus
™
RTU (remote terminal unit) protocol to read and
write to registers that can be viewed or changed from a personal computer.
Sending ASCII text commands to the MicroDIN will not work.
Access Via Registers
Each MicroDIN parameter has a corresponding Modbus
™
register and access
privileges. The value of each parameter is stored in a Modbus
™
register. The
access privilege — read only, write only or read/write — determines whether you
can change and/or view a parameter’s value. Chapter 5 explains some of the
interactions between parameters. The tables at the end of this chapter show the
parameters and their setup order.
MicroDIN Supports...
Multiple Register Reads
MicroDIN supports Modbus
™
Commands 03 and 04 read of a 1- to 32-register
block. Responses from -1999 to 9999 are valid data for up to 32 register writes.
Modbus
™
32000 Errors
A Modbus
™
read command response of -32000 indicates that a register is not
implemented; -32001, register not active; or -32002, not read accessible.
Single Register Writes
MicroDIN supports a Modbus
™
write command (06) to a single register.
Multiple Register Writes
MicroDIN supports a Modbus
™
write command (16) for multiple writes as long
as the data length is 1.
Writing to address 0 broadcasts to all devices on the network.
Write Exceptions
MicroDIN supports write exceptions: 01, illegal function; 02, illegal register; 03,
illegal data.
Loop Back
MicroDIN supports a Modbus
™
write command 08, “loop back” to echo a
message.
Compatible Software
You will need compatible software to interact with a MicroDIN controller. One
such program is included with the MicroDIN Startup Kit. If you are accustomed
to using a Modbus
™
, see the Appendix for information to help write your own
Modbus
™
software application.
çCAUTION:
Avoid writing
continuously to
EEPROM memory.
Continuous writes
may result in
premature control
failure, system
downtime and
damage to
processes and
equipment.
See Disable Non-
volatile Memory
(System Group),
Ch. 5.
- 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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