Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador descarregar pdf (Página 102)

7–15Communication Commands

Publication

17706.5.16 - October 1996

protected bit write

Sets or resets individual bits within limited areas of the PLC data

table memory. The access is limited by memory access rungs in the

communication zone of the PLC processor’s ladder diagram

program.

CMD

STS

TNS ADDR

STS

TNS

CMD

DATA

(max. 244 bytes)

SET RESET

to 60 masks of this form.

DST SRC

SRC DST

DATA ADDR SET RESET

DATA is:

•4byte blocks, each of

which contains a 16bit

address field

•Use ADDR to specify the

address of the byte to be

modified in the PLC data

table memory.

•Use SET to specify which

bits to set to 1 in the

addressed PLC byte.

•Use RESET to specify

which bits to reset to 0 in

the addressed PLC byte.

address

field

•a set mask

•a reset mask

•Put the low byte (least

significant bits) of the PLC

address value into the first

byte of the ADDR field.

•A 1 in the SET bit position

means to set the

corresponding bit in the

addressed PLC byte to 1.

•A 1 in a RESET bit position

means to reset the

corresponding bit in the

addressed PLC byte to 0.

•A 0 in the SET bit position

means to leave the

corresponding bit in the

PLC byte unchanged.

•A 0 in the RESET bit

position means to leave

the corresponding bit in the

PLC byte unchanged.

Important: For some PLC processors, the interface module at the

receiving PLC node executes this command by making

a copy of the addressed PLC byte. It then sets or resets

the appropriate bits and writes the byte back into PLC

memory. At the same time, the PLC processor can

change the states of the original bits in memory.

Because of this, some data bits may unintentionally get

overwritten.

• 1774PLC

• PLC2

• PLC3

• PLC5

• PLC5/250

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 250 251

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