Technical data

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Manual – MOVI-PLC® advanced DH.41B Controller

Parameter setting via PROFIBUS-DP

Operating Characteristics on PROFIBUS-DP

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 the MOVI-PLC

advanced DHF41B control card must be triggered by

edge control using the handshake bit 6. For this purpose, the value of this bit is

altered (toggled) for each new service that is 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 is executed as soon as the handshake bit received

in the control card is the same as the one that was sent.

• Status bit 7 indicates whether the service was carried out properly or if errors

occurred.

Index addressing Byte 2: Index high and byte 3: Index low determines the parameter that is to be read or

written via the fieldbus system. The parameters of the MOVI-PLC

advanced DHF41B

control card are addressed using a standard index regardless of the fieldbus system that

is connected.

Byte 1 is reserved and must always be set to 0x00.

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