2nd Ave DVP-0204520-02 operation manual Bit-Strobe Command, Display of Node Status on Network, Plc

DeviceNet Network Scanner DVPDNET-SL

editing area to 0.

„When M1 = On, DVPDNET-SL will send out request message. Write 0004Hex into Class 99 >> Instance 1 >> Attribue 2 of the target equipment (node address: 02). If the communication of explicit message is successful, the slave will return with a response message.

„When M1 = On, DVPDNET-SL will only send out request message once. If you would like it to send out request message again, you will have to change ReqID.

„When the writing is successfully done, the message responded from the target equipment will be stored in D6000 ~ D6003.

7 Bit-Strobe Command

7.1Principle of Bit-Strobe

Bit-strobe is one of the standard I/O transmission methors for DeviceNet. The length of command is fixed to 8 bytes (i.e. 64 bits), and every bit corresponds to a slave.

PLC		Corresponding nodes on the network
device	b15	b14	b13	…	b1	b0
D6282	Node 15	Node 14	Node 13	…	Node 1	Node 0
D6283	Node 31	Node 30	Node 29	…	Node 17	Node 16
D6284	Node 47	Node 46	Node 45	…	Node 33	Node 32
D6285	Node 63	Node 62	Node 61	…	Node 49	Node 48

When b0 of D6282 = 0, the node 0 equipment will be selected, and it will need to respond with a message to the master. When b0 and b1 of D6282 = 0, the node 0 and node 1 equipment will be selected, and they will beed to respond with a message to the master.

D6283

D6282

b31 b30

b18 b17 b16 b15 b14

b2 b1 b0

Node 0

Node 1

Node 2

Node 14

In the bit-strobe mode, the master will not send control data to the slave node. However, when its corresponding bit is set to 0, the slave node will have to respond with I/O data to the master. When its corresponding bit is set to 1, the slave node will not have to respond with I/O data to the master.

8 Display of Node Status on Network

8.1Display of Node Status in Scan List

DVPDNET-SL does read-time monitoring to the nodes in the scan list and maps the status of every node to a bit. You can acquire the node status by monitoring D6032 ~ D6035. See the table below for the corresponding relation between PLC devices and the nodes on the network:

26 DVP-PLC Operation Manual