Delta DVP-0204520-03 - Manual (Page 18)

DeviceNet Network Scanner DVPDNET-SL
5.2 Structure 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
1) Structure of request message
See the table below:
Request Message
PLC device
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
D6250 ReqID Command
D6251 Port Size
D6252
Message Header
Service Code MAC ID
D6253 High byte of Class ID Low byte of Class ID
D6254 High byte of Instance ID Low byte of Instance ID
D6255
Message Data
Reserved Attribute ID (optional)
D6256 ~ D6281 Service Data
„ Command: Fixed to “01Hex”.
„ ReqID: The request ID. Whenever an explicit message is sent out, the message will be given a ReqID
for DVPDNET-SL to identify. For the next explicit message to be sent out, you have to change the ID
number. ReqID = 0 indicates that DVPDNET-SL will not send out explicit message. Range of ReqID:
00Hex ~ FFHex.
„ Size: The length of the message, starting from D6253. The high bytes of D6255 are reserved. When
the data length is being calculated, D6255 is counted as 1 byte. The maximum data length is 58 bytes.
Errors will occur when the length is longer than 58 bytes. Unit: byte.
„ Port: The communication port. Fixed to “00Hex".
„ MAC ID: The node address of the target equipment on DeviceNet.
„ Service Code: The service code of the explicit message. See the meanings of the codes in the table
below:
Service Code Explanation
01Hex Read all attributes (Get_Attribute_All)
02Hex Set up all attributes (Set_Attribute_All)
0EHex Read a single attribute (Get_Attribute_Single)
10Hex Set up a single attribute (Set_Attribute_Single)
DVP-PLC Operation Manual 15