FCI MT100 - Table 8 - HART Common Practice Commands

MT100 Multipoint Flow Meter OPERATION
MT100 HART Common Practice Commands
The MT100 supports Common Practice commands 35, 40, 42, 44, 45, 46, 50 and 51. Table 8 below summarizes the instrument’s HART
Common Practice command set and the data associated with each command.
Table 8 – HART Common Practice Commands
Command 35: Write Primary Variable (PV) Range Values
Byte
Format
Description
Request Data Bytes
0
Unsigned-8
PV Upper and Lower Range Values Units Code
1–4
Float
PV Upper Range Value (Customer Max. Flow Limit)
5–8
Float
PV Lower Range Value (Customer Min. Flow Limit)
Response Data Bytes
1
0
Unsigned-8
PV Upper and Lower Range Values Units Code
1–4
Float
PV Upper Range Value
5–8
Float
PV Lower Range Value
Code
Class
Description
Response Codes
0
Success
No Command-Specific Errors
1–8
Undefined
9
Error
Lower Range Value Too High
10
Error
Lower Range Value Too Low
11
Error
Upper Range Value Too High
12
Error
Upper Range Value Too Low
13–17
Error
Upper and Lower Range Values Out Of Limits
18
Error
Invalid Units Code
19–28
Undefined
29
Error
Invalid Span
30–127
Undefined
Note: 1. The value returned in the response data bytes reflects the rounded or truncated value actually used by the
device.
Command 40: Enter/Exit Fixed Current Mode
Byte
Format
Description
Request Data Bytes
1
0–3
Float
PV Fixed Current Level (mA units); “0” to Exit Fixed Current
Response Data Bytes
0–3
Float
Actual PV Current Level
Code
Class
Description
Response Codes
0
Success
No Command-Specific Errors
1–2
Undefined
3
Error
Passed Parameter Too Large
4
Error
Passed Parameter Too Small
5–10
Undefined
11
Error
Loop Current Not Active (Device in Multidrop Mode)
12–127
Undefined
Notes: 1. Specify a value (in mA) to drive Ch. 1 to a particular output value. Specify “0” to exit the fixed current mode.
Command 42: Perform Device Reset (Soft Reset of Flow Meter)
1
Byte
Format
Description
Request Data Bytes
None
Response Data Bytes
None
Code
Class
Description
Response Codes
None
Note: 1. Send Command 42 (no data) to reset the instrument. No response is returned due to reboot.
Fluid Components International LLC 55