Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Pobierz pdf (Strona 171)

Message Formats

Appendix A

A9

data table memory. Put the low byte (lest 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. A1 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:

DLE

SRC C

TNS

ADDR

SET RESET

Up to 61 masks of this form

STX

DLE ETX

BCC

Reply Format:

DST SRC

S TNS

TS TNS

DLE STX

DLE ETX

BCC

Protected Write

Use this command to write words of data into limited areas of the PC data

table memory. Your access can be limited by memory access rungs in the

communication zone of the PC’s ladder diagram program.

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 238 239

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