Rockwell-automation 900 Temperature Controller Communications Function Bedienungsanleitung Seite 64
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Publication 900-UM004D-EN-E - July 2010
4-6 Modbus Communications Procedure
Variable Area
The variable area is the region of memory used to exchange data with the
900-TC8, 900-TC16, or 900-TC32 through communications.
Operations such as reading the process value and Reading/Writing parameters
are performed on the variable area.
On the other hand, operation commands do not use the variable area.
Figure 4.5
When accessing the variable area, the position of a variable in the variable area
is specified with a word identifier, area number, and address in the area.
Addresses
An address is appended to each of the variable types. Express addresses in
2-byte hexadecimal and append them for the specified access size. Each
address is composed of a word identifier, area number, and address in the area.
Figure 4.6
900-TC8 or 900-TC16
Microcomputer
Variable area
Read/write
Operation
commands, etc.
• Four-byte Mode
• Two-byte Mode
Address (2 bytes)
Area number (00 to 13)
Address in area (00 to FE): 128 variables
Word identifier (0 to 3)
Address (2 bytes)
Area number (20 to 33)
Address in area (00 to 7F): 128 variables
Word identifier (0 to 3)
0
0
0* ****A6 A0
A1
A2A3
A4
A5 0
A
6
A0
A1
A2A3
A4
A5
0
0
*****
1
- Functions 1
- Important User Information 2
- European Communities (EC) 3
- Directive Compliance 3
- Table of Contents 5
- -ii Table of Contents 6
- Safety Precautions 7
- Conventions Used in This 7
- How to Read Display Symbols 8
- About Communications Methods 9
- Communications 10
- Specifications 10
- Transmission procedure 10
- Interface 11
- Communications Parameter 14
- Communication Parameters 15
- Setting Communications 16
- 900-TCx (CompoWay/F) 17
- Response Frame 18
- Communications Data 19
- Example of End Code 19
- Structure of Command Text 21
- Type Code (Variable Type) 22
- Addresses 22
- Number of Elements 23
- List of Services 23
- Detailed Description of 24
- Services 24
- Response code 25
- Write to Variable Area 26
- Bit Position 28
- Response Code 28
- Read Controller Attributes 31
- Read Controller Status 32
- Echoback Test 33
- Test data 34
- Operation Commands 35
- Response Code List 42
- 3-2 Communications Data 44
- Communications Data 3-3 45
- 3-4 Communications Data 46
- Communications Data 3-5 47
- 3-6 Communications Data 48
- Communications Data 3-7 49
- 3-8 Communications Data 50
- Communications Data 3-9 51
- 3-10 Communications Data 52
- Communications Data 3-11 53
- 3-12 Communications Data 54
- Status Structure 55
- Bit position 56
- Table 3.4 Status Details 57
- Table 3.5 Status 2 Contents 58
- Data Format 59
- CRC-16 Calculation Example 60
- Error Codes 62
- Function List 63
- Variable Area 64
- Detailed Description of the 66
- Write Variable Area 69
- Example Command and Response 72
- Write variable address 73
- Command: 75
- Response: 75
- Variable Area (Setting 83
- Range) List 83
- Advanced 84
- Setting 84
- Table 5.6 89
- Four-byte mode Two-byte mode 89
- Figure 5.1 Status Structure 96
- Figure 5.3 Status 2 Structure 97
- Table 5.11 Status Details 98
- Table 5.12 Status 2 Details 99
- Back Cover 103
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