Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 172)

Message Formats

Appendix A

A10

Command Format:

DLE

SRC C

TNS

TNS ADDR

STX

DLE ETX

BCC

DATA - Max of 243 bytes

Reply Format:

DST SRC

TNS

MD TS

TNS

DLE STX

DLE ETX

BCC

Unprotected Bit Write

Use this command to set or reset individual bits in any area of PC data

table memory. The data field in this packet consists of 4–byte blocks,

each of which contains a 16–bit address field, a set mask, and a reset

mask. Use the ADDR field to specify the address of the byte to be

modified in the PC data table memory. Put the low byte (least significant

bits) of the PC address value into the first byte of the ADDR field.

Use the SET mask to specify which bits to set to 1 in the addressed PC

byte. A1 in a bit position of the SET mask means to set the corresponding

bit in the addressed PC byte to 1; a 0 in a bit position of the SET mask

means to leave the corresponding bit in the PC byte unchanged.

Use the RESET mask to specify which bits to reset to 0 in the addressed

PC byte. A 1 in a bit position of the RESET mask means to reset the

corresponding bit in the addressed PC byte to 0; a 0 in a bit position of the

RESET mask means to leave the corresponding bit in the PC byte

unchanged.

Note that the interface module at the receiving PC station executes this

command by first making a copy of the addressed PC byte. It then sets or

resets the appropriate bits and writes the byte back into PC memory. At

the same time, the PC processor can be changing the states of the original

bits in memory. Because of this, some data bits may unintentionally be

overwritten.

Command Format:

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 172

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