Omron CJ1W-DRM21, Operation Manual

Page: 211 / 350

6-23
6 Message Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-3 Recei
ving
E
x
plicit Messa
g
e
s
6
6-3-1 List of PLC Obje
ct Ser
v
ice
s
Word Data Read reads any I/O memory area data in the memory used for CJ-series Unit in a CPU Unit
with a CJ-series DeviceNet Unit mounted. The read word data is in word units. The response block is
returned from low to high bytes.
z
Command Block
* A body format of either 8 bits or 16 bits is possible.
z
Response Block
z
Parameters
Service Code (command, response): 1D Hex is specified for commands. For responses, the high-
est bit will turn ON and 9D Hex will be returned.
Class ID (command): Always 2F Hex.
Instance ID (command): The type of area in the memory used for CJ-series Unit that will read the
data is specified as shown in the following table.
Address L, Address H (command): The address of the first word to read the data from is specified
in hexadecimal as shown below.
Address L: The lower 2 digits when the first word address is given in 4-digit hexadecimal.
Address H: The higher 2 digits when the first word address is given in 4-digit hexadecimal.
No. of Read Words (command): The number of words of read data is specified in 1-byte (2-digit)
hexadecimal. The range is 01 to 64 Hex (1 to 100 decimal).
Read Data (response): The specified area, word, and byte data is returned in order from word L
(low byte: bits 0 to 7) to word H (high byte: bits 8 to 15).
z
Important Points
The actual address L, address H, and number of write data bytes that can be specified depends on
the CPU Unit of the CJ-series DeviceNet Unit and the Memory Area. Do not exceed the boundary of
the data areas for the CPU Unit you are using.
Word Data Read (Service Code: 1D Hex)
Instance ID (Hex) CPU Unit memory area
for read
Word range
01 CIO CIO 0000 to CIO 6143
03 DM D00000 to D32767
04 WR W000 to W511
05 HR H000 to H511
08 to 14 EM, banks 0 to C En_00000 to En_32767
(n: 0 to C)
Class ID
Instance ID
1C 2F
(*)
(*)
Address L
Service Code Address H
No. of words read
9D
Service Code
Word data L
Word data H
Word data L
Word data H
Read data (200 bytes max.)