Technical data
54
Manual – MOVI-PLC® advanced DH.41B Controller
5
Parameter setting via PROFIBUS-DP
Operating Characteristics on PROFIBUS-DP
5.3 Parameter setting via PROFIBUS-DP
In the PROFIBUS-DP system, the parameters are accessed via the 8-byte MOVILINK
®
parameter channel. This parameter channel offers extra parameter services in addition
to the conventional Read and Write services.
Structure of the
8-byte
MOVILINK
®
parameter
channel
PROFIBUS-DP enables access to the MOVI-PLC
®
advanced DHF41B control card
parameters via the "parameter process data object" (PPO). This PPO is transmitted
cyclically and contains the process data channel [2] and a parameter channel [1] that
can be used to exchange acyclical parameter values (→ following Figure).
The following table shows the structure of the 8-byte MOVILINK
®
parameter channel.
Its basic structure is as follows:
• One management byte
• One reserved byte
• Two index bytes
• Four data bytes
61495AXX
Figure 12: Communication via PROFIBUS-DP
Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7
Manage-
ment
Reserved
Index high Index low Data MSB Data Data Data LSB
Parameter index 4-byte data
[1] [2]
[2][1]
DHF41B
2
2
2
2
0
1
2
3
2
2
2
4
5
6
2
7
2
4
6
1
2
3
X34
X35
X36
X37
1
3
5
1
2
3
1
2
3
1
2
3
1
2
3
X32X33
2
4
6
1
3
5
8
10
7
9
X31
X38
L18L17
L12
X30P
T1
S1
L1 L2 L3 L5XM L6 L7 L8 L9L4 L 10
3
4
2
1
L11 L16L15L14L13
1
5
X30D
S2
00
I