Rockwell-automation 900 Temperature Controller Communications Function Manual de usuario Pagina 76
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Publication 900-UM004D-EN-E - July 2010
4-18 Modbus Communications Procedure
Operation Commands and Precautions
• Communications Writing
Set the Communications Writing parameter to “ON” (enabled) or
“OFF” (disabled) with the related information setting. The setting can
be accepted in both setup area 0 and setup area 1. An operation error
will occur, however, if communications writing enable/disable is set for
an event input.
• RUN/STOP
Set control to “run” or “stop” with the related information setting. The
setting can be accepted in both setup area 0 and setup area 1. An
operation error will occur, however, if RUN/STOP is set for an event
input.
•Multi-SP
Set four set points beforehand in the adjustment level so that you can
switch to a desired set point. The setting can be accepted in both setup
area 0 and setup area 1. An operation error will occur in the following
situations.
– When AT is being executed.
– When the Multi-SP Uses parameter is set to OFF.
– When the Multi-SP Uses parameter is set to ON but multi-SP is set
for an event input (Number of Multi-SP Uses > 0).
• AT Execute/Cancel
Set AT (auto-tuning) to “execute” or “cancel” with the related
information setting. This command can be accepted in setup area 0 only.
An “operation error” will be generated in the following instances:
– When the RUN/STOP parameter is set to “stop”
– When the command is executed in “setup area 1”
– When ON/OFF control is being used
– When 40% AT is specified during 100% AT execution.
– When 100% AT is specified during 40% AT execution.
In addition, a parameter error will occur if 40% AT execution is
specified during heating and cooling control.
Note: If the same type of AT execution is specified during AT execution
(e.g., if 100% AT execution is specified during 100% AT execution), the
AT will not be restarted and the operation will end in normal
completion with no processing.
•Write Mode
Set either “backup mode” or “RAM write mode” with the related
information setting. The setting can be accepted in both setup area 0
and setup area 1.
The number of EEPROM (non-volatile memory) write operations is
limited. Therefore, use RAM write mode when frequently overwriting
data.
- 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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