Description of IO-Link
7100.006434_Bus description_PSD4xx_IO_J_ENG
28
2022-09-13
2.4.
Definition of process data
1) Process
output
data: 6 or 8 byte (from the point of view of the IO-Link master)
Assignment for variants
without
the option
“target speed in process data”
(i.e. variants with the feature
“software modules” = “1”, “M” or “S”)
Bit
Byte
Meaning
Corresponding IO-Link parameters
0..15
(16 Bit)
0, 1
Command byte
110
16..47
(32 Bit)
2..5
Target position
112
Assignment for variants
with
the option
“target speed in process data”
(i.e. variants with the feature
“software modules” = “P” or “Z”)
Bit
Byte
Meaning
Corresponding IO-Link parameters
0..15
(16 Bit)
0, 1
Target speed
137 (Positioning run) or
138 (Manual run)
16..31
(16 Bit)
2, 3
Command byte
110
32..63
(32 Bit)
4..7
Target position
112
Note:
For reasons of compatibility, the
Target Speed
in the process data has been placed
before the
Command Byte
and
Target Position
.
This makes it possible for some Control Units to continue to use function blocks that have
already been developed and, if necessary, to add the setpoint speed as bytes 6..7
at the
end of the block
consisting of the
Command Byte
and
Target Position
.
2) Process
input
data: 8 byte (from the point of view of the IO-Link master)
Bit
Byte
Meaning
Corresponding IO-Link parameters
0..15
(16 Bit)
0, 1
Status byte
64, see chap 3.5.
16..31
(16 Bit)
2, 3
Actual rpm
66
32..63
(32 Bit)
4..7
Actual position
68
Note:
The assignments cannot be changed.
Some IO-Link bus masters process the data in the opposite byte order, this applies to
both the output and the input data. In practice, the order of the data can be easily
determined by cyclically switching the motor voltage on and off when the bus connection
is established and the drive is at standst
ill. Bit 4 of the status word (“Motor power
present”) then changes level cyclically accordingly, thus byte 0 of the status word can be
identified.
