Watlow CLS200, MLS300 and CAS200 User Manual Page 13
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Chapter 1: ANAFAZE/AB Protocol
Communications Specification 7
CMD
•
The CMD byte indicates the command that the host software sends
to the controller. The software sends a read (x01) or write (x08).
When the controller replies, it returns the read or write command
with the 7th bit set—in other words, it sends an x41 or x48.
STS (The Status Byte)
•
The controller uses the status byte, or STS, to return general status
and error flags to the host software. (The controller ignores the status
byte in the host software's command packet.) The next table shows
status byte values and definitions.
•
An “x” in the status bytes below indicates that the associated nibble
may contain additional information. In most cases, the status byte is
composed of two independent nibbles. Each nibble is independent
so that two codes can return at once. For example, status code F1
indicates that data has changed (Fx) and the controller is being
updated through the front panel (x1).
TNSL
•
Least significant byte of the transaction number. This is the first half
of a “message stamp.”
•
The controller sends back the TNSL and TNSH exactly as it received
them, so host software can use the TNSL and TNSH bytes to keep
track of message packets.
TNSH
•
Most significant byte of the transaction number. This is the second
half of the “message stamp.”
Status
in Hex
Description
00 The controller has nothing to report, or AB protocol is selected.
01 Access denied for editing. The controller is being updated through the
front panel.
02 AIM Comm failure.
A0 A controller reset occurred.
Cx The controller received a command that was not a block read or block
write. (Command Error)
Dx The block write command attempted to write beyond a particular parame-
ter block boundary, or the host software attempted to access a data table
block that does not exist. (Data Boundary Error)
Ex The Alarm_Status variable has changed. The software should query the
alarm status block to determine the particular alarm flag that changed.
Fx The controller altered shared data, either internally (from the firmware) or
externally (from the keyboard). The host software should read the Data
Changed Register to determine which data has been altered and update
its own run-time memory.
- 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
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