Watlow CLS200, MLS300 and CAS200 User Manual Page 36
- Page / 92
- Table of contents
- BOOKMARKS
Rated. / 5. Based on customer reviews
30 Communications Specification
Chapter 2: Modbus-RTU Protocol
Writing Data
Watlow Anafaze controller memory is divided into approximately 100
parameters with unique control functions, such as temperature, set
point, etc. Each parameter can have several Modbus-RTU addresses
associated with it. When a Modbus-RTU host writes data to a controller
parameter, the data sent may “command” controller firmware to perform
specific functions. While host writes to multiple registers are permitted
within a parameter, controller function hierarchies necessitate that only
one parameter may be written at a time. Any data written past a
parameter boundary is simply rejected.
Reading Data
The same parameter-based model is used for reading data from the
controller’s Modbus-RTU interface. Modbus-RTU allows multiple
register block reads for all types of registers. While Watlow Anafaze
Modbus-RTU allows this type of read function, unexpected results may
occur when reading registers that span across the boundaries of more
than one parameter. A query from a Modbus-RTU host starts specific
firmware processes that allow data to be formatted properly for the
Modbus-RTU host. The sequence proceeds as follows:
(1) A query for data comes in from a Modbus-RTU host.
(2) The controller determines what parameter among the hundred or so
is being queried.
(3) The data format from internal memory is converted for a Modbus-
RTU interface.
(a) Data for registers 40001 to 49999 and registers 30001 to
39999 are always two bytes in length. If the internal con-
troller memory is in bit or byte size, the data is padded
appropriately.
(b) The byte order from internal memory is LSB to MSB (least
significant byte to most significant byte. For example, the
LSB first value for 550.0° would be x7C 15. The MSB first
value would be x15 7C.) while the Modbus-RTU is MSB to
LSB. Bytes are swapped as needed.
(4) Parameter data is sent to the Modbus-RTU interface.
When data from adjacent parameters is read and the parameters share
the same data type (bit, byte or integer), the information is formatted
correctly. However, if they do not share the same data type, host
software could be written to pad and/or swap bytes as necessary.
- CLS200, MLS300 1
- Communications 1
- Specification 1
- Warranty 2
- Contents 3
- Protocol Syntax 9
- Transaction Sequence 10
- Packet Format 12
- Codes in a Packet 12
- Error Checking 14
- Cyclic Redundancy Check (CRC) 15
- Examples 16
- Block Write 19
- Message Data 20
- Data for a Write Command 21
- Two-Byte Data Types 21
- Figuring Block Size 21
- Anafaze/AB Data Table Summary 22
- Number Description 24
- Address 24
- Type Number of Bytes 24
- Overview 27
- The Query-Response Cycle 28
- Serial Transmission 28
- Message Framing 29
- Contents of the Data Field 30
- CRC Error Checking 31
- Function Codes 32
- Diagnostic Subfunctions 33
- Writing Data 36
- Reading Data 36
- Write Examples 38
- Modbus-RTU Data Table Summary 39
- Chapter 3: 45
- All Units 17, 18 47
- Enhanced Features options 49
- Parameters (by number) 51
- Input Type (3) 52
- Output Type (4) 53
- Setpoint (5) 54
- Process Variable (6) 54
- Output Filter (7) 54
- Output Value (8) 55
- Alarm Deadband (12) 55
- Alarm_Status (13) 56
- Ambient Sensor Readings (15) 58
- Pulse Sample Time (16) 58
- High Process Variable (17) 58
- Low Process Variable (18) 58
- Precision (19) 59
- Cycle Time (20) 60
- Zero Calibration (21) 60
- Full Scale Calibration (22) 60
- Digital Inputs (25) 60
- Digital Outputs (26) 61
- Override Digital Input (28) 61
- Override Polarity (29) 61
- System Status (30) 62
- System Command Register (31) 62
- Data Changed Register (32) 63
- Input Units (33) 63
- EPROM Version Code (34) 64
- Options Register (35) 64
- High Reading (37) 65
- Low Reading (38) 65
- Heat/Cool Spread (39) 65
- Startup Alarm Delay (40) 66
- • Range: See tables below 67
- • Default: 0 67
- Current Segment (47) 68
- Segment Time Remaining (48) 68
- Current Cycle Number (49) 68
- Tolerance Alarm Time (50) 68
- Last Segment (51) 68
- Number of Cycles (52) 69
- Ready Setpoint (53) 69
- Ready Event States (54) 69
- Segment Setpoint (55) 70
- Segment Time (58) 72
- Tolerance (59) 72
- Ramp/Soak Flags (60) 72
- Output Limit (61) 73
- Output Limit Time (62) 73
- Alarm_Control (63) 74
- Alarm_Acknowledge (64) 74
- Alarm_Mask (65) 74
- Alarm_Enable (66) 74
- AIM Fail Output (68) 75
- Output Linearity Curve (69) 76
- SDAC Mode (70) 76
- SDAC Low Value (71) 76
- SDAC High Value (72) 76
- Save Setup to Job (73) 77
- Input Filter (74) 77
- Loop Alarm Delay (75) 77
- Loop Names (77) 77
- Channel Name (78) 78
- Manufacturing Test (80) 78
- Cascade Maximum Setpoint (89) 80
- Cascade Base Setpoint (87) 80
- Cascade Minimum Setpoint (88) 80
- Loop Status (96) 82
- Output Type/Disable (97) 82
- Output Reverse/Direct (98) 82
- Controller Type (99) 83
- Ramp/Soak Profile Number (100) 83
- Controller Address (101) 83
- Baud Rate (102) 83
- Ready Events (103) 84
- Appendix A: 85
- Communications Driver 85
- Close_Comm_Port() 86
- DownLoad() 86
- UpLoad() 87
- Glossary 89
Related products and manuals for Sensors Watlow CLS200, MLS300 and CAS200
Sensors Watlow CLS User Manual
(180 pages)
(180 pages)
Sensors Watlow CLS200 User Manual
(251 pages)
(251 pages)
(2 pages)
(2 pages)
(2 pages)
Sensors Watlow CPC400 User Manual
(230 pages)
(230 pages)
© 2020, manymanuals.com. All rights reserved. | 0.121 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals