Chapter 11: Send/Receive Function - Sharp JW-20FL5 User Manual

Chapter 11: SEND/RECEIVE function

The SEND/RECEIVE functions are exclusive SHARP functions. These can only be used between PCs
equipped with FL-net modules (board).
Note: The SEND/RECEIVE functions can be used only when a JW30H, JW50H/70H/100H, or a J-
board (Z-500 series) is used as the host PC. This function cannot be used with the JW20H or J-
board (Z-300 series).
The SEND/RECEIVE functions allow the exchange of data between certain nodes within a specified
maximum time. The SEND function is used to declare a target node and write data from that node. The
RECEIVE function is used to declare which node will return data to the node issuing the call and then it
receives the data.
[An example of the SEND function]
FL-net
Node
1
[An example of the RECEIVE function]
FL-net
Node
1
- Dedicated instructions are used to execute the SEND/RECEIVE functions.
Dedicated
instruction
F-203 (OPCH) Declare a station to communicate with (single layer)
F-204 (SEND) Write data to the target station
F-205 (RCV) Read data from the target station
Enter the module No. (port No.)/channel of the host module (board) by using the F-203 (OPCH) instruc-
tion. This instruction includes the target node number, and the data memory address in the target node.
Enter the data memory address for number of bytes to be transferred using the F-204 (SEND) / F-205
(RCV) instructions. Using these instructions, when the JW-50FL receives a response from the target
node, it completes this function automatically. There is no need for special program for the target node
PC.
- When using the SEND/RECEIVE functions, the data route between the control module (CPU board)
and FL-net module (board) is referred to as a "channel." There are four channels (CH0 to CH3) for
each module (board). Each channel can transfer 256 bytes of data. Therefore, in a ladder program, up
to four SEND/RECEIVE functions can be executed at once.
[Ex.]
Control module
CH0
CH1
CH2
CH3
Request to write
Response
Node Node
2 3
Request to read
Response
Node Node
2 3
Detail
FL-net module (node 2)
Node 3
11-1
Chapter 11: SEND/RECEIVE function
Node
4
Node
4
Node 4 Node 5
11
Node 6