YOKOGAWA F3SP71-4S - Read Discrete Inputs ($02)

3-2
IM 34M06P15-03E 2nd Edition: Jan. 31, 2012-00
3.2 Read Discrete Inputs ($02)
Reads the status (on/off) of a single or multiple inputs.
The amount of devices that can be accessed with a single request is 1 to 2,000 points.
Request Format (Master => Slave)
F030102.VSD
Function Code
Data
$02
1-byte 2-byte
2-byte
Starting Input Nos.
($0000 to $FFFF)
Read Points
($0001 to $07D0)
Response Format (Slave => Master)
(At Normal Completion)
Function Code
Data
$02
1-byte
Read Length
n
($01 to $FA)
1-byte 1-byte
Device Data
1
Device Data
n
1-byte
···
(At Faulty Completion)
Function Code
Data
$82
1-byte
Error Code
1-byte
･･･
Bit Device Storage Order
- Stored from lower => higher-level bit order.
- Remainder bits are made "0".
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
Device Data
Device Data n
0 : OFF
1 : ON