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Manual – MOVI-PLC® advanced DHF41B DeviceNet and PROFIBUS DP-V1 Fieldbus Interfaces
10
Parameter setting via PROFIBUS-DP
PROFIBUS DP-V1 Operating Characteristics
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
Management of
the 8-byte
MOVILINK
®
parameter channel
The entire procedure for setting parameters is coordinated using management byte 0.
This byte provides important service parameters such as service identifier, data length,
version and status of the service performed.
The following table shows the structure of the 8-byte MOVILINK
®
parameter channel.
• Bits 0, 1, 2 and 3 contain the service identifier. These bits determine which service is
to be executed.
• Bits 4 and 5 specify the data length in bytes for the write service. The data length
should be set to 4 bytes for the MOVI-PLC
®
advanced
DHF41B control card.
• Bit 6 is used as the handshake bit between the higher-level controller and the MOVI-
PLC
®
advanced
DHF41B control card. Bit 6 triggers the implementation of the
transmitted service in the control card. With PROFIBUS-DP, the parameter channel
is transmitted cyclically with the process data. For this reason, the execution of the
service in MOVI-PLC
®
advanced
DHF41B must be triggered by edge control using
handshake bit 6. For this purpose, the value of this bit is toggled for each new service
to be executed. The MOVI-PLC
®
advanced
DHF41B control card uses handshake
bit 6 to signal whether the service was executed or not. The service was executed if
the handshake bit received in the control is identical with the transmitted handshake
bit.
• Status bit 7 indicates whether the service was carried out properly or if errors
occurred.
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Manage-
ment
Subindex
Index high
Index low
MSB data
Data
Data
LSB data
Parameter index
4-byte data
7 / MSB
6
5
4
3
2
1
0 / LSB
Service identifier
0000 = No service
0001 = Read parameter
0010 = Write parameter
0011 = Write parameter volatile
0100 = Read minimum
0101 = Read maximum
0110 = Read default
0111 = Read scale
1000 = Read attribute
Data length
00 = 1 byte
01 = 2 bytes
10 = 3 bytes
11 = 4 bytes (must be set)
Handshake bit
Must be changed on every new task in cyclical transmission.
Status bit
0 = No error during execution of service
1 = Error during execution of service
0
0
I
Содержание DHF41B
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