User Manual PLC-3 FAMILY I/0 Instruction Manual

Binary Command Language
Appendix A
A-23
The processor responds to a write block command with one of the
following response codes:
Response Codes
Hex Description
00 Success
04 Address unknown
05 Size too big
06 Access not allowed
08 Address not complete
0F No privilege
If the size too big response returns, the processor stores data which fits
into the existing memory locations. The rest is lost. If any code besides
success or size too big is returned, no data is written into memory. The
following response block shows a successful write block command:
STX
02
OSC
01
SIZ
01
RSP
00
ETX
03
CHK
07
The size is specified in one byte. This is true of all size specifiers within
the data buffer of a response block.
ReadModifyWrite Command
Hex: 16
Parameters: Address of the word to modify, one word AND mask, one
word OR mask
Description: The following example command block executes the
read-modify-write command:
STX
02
ISC
0D
SIZ
08
CMD
16 24 05 03
ETX
03
CHK
07
DAT
55 55 0F
0F
The data bytes store:
address mask (24 hex)
first and second address bytes (05, 03 hex)
lower and upper bytes of AND mask (55 hex)
lower and upper bytes of OR mask (0F hex)