Omron E5AN, User Manual

Page: 22 / 54

CHAPTER 2 CompoWay/F COMMUNICATIONS PROCEDURES
E5AN/EN/CN/GN
2--8
2.3 Details of Services
This service reads from variable areas.
MRC SRC
Variable
type
Read start
address
Bit
position
Number of
elements
0 1 0 1 0 0
2 2 2 4 2 4
MRC SRC Response
code
Read data
(for number of elements)
0 1 0 1
2 2 4 0 or 8 or 16
Service request PDU
Service response PDU
(1) Variable type and read start address
For details on variable types and read start addresses, see “Chapter 3
Communications Data.”
(2) Bit position
Bit accessing is not supported on the E5AN/EN/CN/GN. Fixed to
“00”.
(3) Number of elements
Number of
elements
Process
0000 Read is not carried out (the service response PDU is not
appended with read data), and processing ends in “normal
completion.”
0001 to 0002 Read is carried out, and processing ends in “normal completion.”
(4) Response code
At normal completion
Response code Name Description
0000 Normal completion No errors were found.
At occurrence of error
Response code Error name Cause
1001 Command too long The command is too long.
1002 Command too short The command is too short.
1101 Area type error The variable type is wrong.
1103 Start address out-of-
range error
The read start address is
out of range.
110B Response too long The number of elements is
larger than “0002”.
1100 Parameter error The bit position is other than
“00”.
2203 Operation error EEPROM error
J
Read from
variable area