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. 1) Structure of request message See the table below: „ 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. „ Port: The communication port. Fixed to “00Hex". Errors will occur when the length is longer than 58 bytes. Unit: byte. „ 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:
DVP-PLC Operation Manual 15 PLC device Mapping area Mapping length D6000 ~ D6031 Explicit response message editing area 64 bytes D6250 ~ D6281 Explicit request message editing area 64 bytes Request Message PLC device 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 D6250 Message Header ReqID Command D6251 Port Size D6252 Service Code MAC ID D6253 Message Data High byte of Class ID Low byte of Class ID D6254 High byte of Instance ID Low byte of Instance ID D6255 Reserved Attribute ID (optional) D6256 ~ D6281 Service Data 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) _ _