Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 368 / 478

A Standard System Protocol
R-34
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
This sequence writes the specified number of elements from the address of the specified parameter
area using a broadcast.
Send Data Word Allocation (3rd Operand of PMCR(260))
Set the number of bytes to write to twice the of the actual number of send data bytes. This is neces-
sary because the data is converted to ASCII data before being written. When hexadecimal data is
converted to ASCII data, data in the first write a0 and +1 is stored in I/O memory in order
from the leftmost word to the rightmost word and the data is sent starting from the send data word
with the largest offset. This is done because user programming handles data in 2-word (4-byte)
units.
Receive Data Word Allocation (4th Operand of PMCR(260))
None. (Specify a dummy value for the operand, such as #0000.)
Parameter Area Broadcast Send
(Sequence No. 617 (Hex 0269))
Offset Contents (data format) Data
+0 Number of send data words 0007 to 00FA Hex (7 to 250 decimal)
+1 (Undefined) ---
+2 Parameter type (4 digits hex) Set the parameter type in hexadecimal code.
+3 First write address (4 digits hex) Set the first write address in hexadecimal code.
+4 Number of elements (4 digits hex) Set the number of elements to write in hexadeci-
mal code.
(The leftmost bit in the number of elements is
always 1.)
+5 Number of bytes to write (4 digits hex) Set the number of bytes of write data to send in
hexadecimal code.
+6
on Write data Set the data to write from the first write address.
Write data
First word of
send data
(Undefined)
+1
+2
+3
+4
Number of elements
+5
Number of send data words
+0
Parameter type
First write address
Number of bytes to write
+6
on
0 0 0 3
0 0 0 2
0 0 0 1
0 0 0 0
4
3
2
1
0 0 0 0 0 0 0 1 0 0 0 3
1 2 3 4
0 0 0 2
Send data words
Send frame