Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Manual de usuario descargar pdf (Pagina 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)

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 ... 195 196

Sin comentarios

Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Manual de usuario Pagina 148