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SECTION 2 CompoWay/F Communications Protocol
2.3 Detailed Description of the Services
■ Read Variable Area
■ Variable Type and Read Start Address
■ Bit Position
■ Number of Elements
■ Response Code
16
This service reads data from a variable area.
Service Request PDU
Variable
Read
MRC SRC
type
start address
0
1 0 1
2
2
2
4
Service Request PDU
MRC SRC
Response
code
0
1 0 1
2
2
4
Note: The read data 12 indicates the weekly timer.
For details on variable types and read start addresses, refer to 3.1
Variable Area (Data Range) List.
Variables of type C0 are read-only.
Bits positions are always 00 except for work bits and HR bits. With the
ZEN, bit access supported only for work bits and HR bits.
For details on bits and applications methods, refer to 1-4 Memory Areas
in the ZEN Programmable Relay Operation Manual (Cat. No. Z211).
Note: Refer to Reading Work Bits and HR Bits on page 20 for details on
reading work bits and HR bits.
Always 0001.
Normal Completion
Response
Name
code
0000
Normal completion
Error Occurred
Response
Error name
code
1001
Command too long
1002
Command too short
Bit
Number of
position
elements
2
4
Read data (for number
of elements)
8 or 12 (See note.)
Description
No errors were found.
Cause
The command is too long.
The command is too short.
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