Rockwell Automation 1797-OE8H FLEX Ex HART Analog Modules User Manual - Manual (Page 148)

Publication 1797-6.5.3 - March 2006
B-24 FLEX Ex HART Module Commands
Command 159
With the Write Special Loop SCAN Parameters command, the threshold data
length (0 to 62) and the SCAN command to be used can be written for the
given current loop and polling addresses (must be 0).
Command 164
With the Cached Data Reply CMD 0, 13, 16 command, results of command 0,
13, and 16 are combined in a response protocol.
Table B.27 Command 159 Request and Response Data Bytes
Byte Description Value
Request Data Bytes
0 CH_NUM Channel number 0…7
1 SHORT_ADDR Short address used for this channel 0…15
2 THRESH Threshold data length for special scan 0…62
3 SCAN_CMD Scan command to be used —
Response Data Bytes
0 CH_NUM Channel number 0…7
1 SHORT_ADDR Short address used for this channel 0…15
2 THRESH Threshold data length for special scan 0…62
3 SCAN_CMD Scan command being used —
4…8 EXT_ADDR Extended address of instrument at address
SHORT_ADDR
Command-specific Response Codes
2 Error Invalid selection
5 Error Too few data bytes received
9 Error First parameter too large (SHORT_ADDR out of range)
11 Error Second parameter too large (THRESH out of range)
16 Error Access restricted
32 Error Busy
64 Error Unknown (no instrument at specified SHORT_ADDR)