Delta Electronics DVPDNET-SL manual Sending Explicit Message from Ladder Diagram

DeviceNet Network Scanner DVPDNET-SL

6 Sending Explicit Message from Ladder Diagram

DVPDNET-SL supports the sending of explicit messages through WPL programs.

6.1The Principle of Explicit Message Sending

1

Explicit request message

(PLC  DVPDNET-SL)

4

Explicit response message

(DVPDNET-SL  PLC)

DV PDNETDVP28SV

RUN

STOP

Explicit request message from master 2

DeviceNet

IFD9502

RJ12

VFD-B

Explicit response message from slave 3

①: DVP-SV MPU sends out explicit request message to DVPDNET-SL according to WPL program.

②: DVPDNET-SL sends out request message to the target equipment.

③: The target equipment processes the request message and responds DVPDNET-SL.

④: DVP-SV MPU stores the response message from DVPDNET-SL to D register. One explicit message transmission is therefore completed.

6.2Structure of Explicit Message

You can edit explicit messages in “explicit request message editing area” and “explicit response message editing area”. See the table below for the corresponding relation between the two areas and PLC devices. If you transmit the request message to be sent out to D6250 ~ D6281, DVPDNET-SL will fill the response message to D6000 ~ D6031.

PLC device	Mapping area	Mapping length
D6000 ~ D6031	Explicit response message editing area	64 bytes
D6250 ~ D6281	Explicit request message editing area	64 bytes

20 DVP-PLC Application Manual