407
Network Instructions
Section 5-29
Limitations
C through C+2 must be within the same data area and must be within the val-
ues specified below. To be able to use SEND(90), the system must have a
Controller Link Unit mounted.
Description
When the execution condition is OFF, SEND(90) is not executed. When the
execution condition is ON, SEND(90) transfers data beginning at word S, to
addresses specified by D in the designated node on the Controller Link Sys-
tem. The control words, beginning with C, specify the number of words to be
sent, the destination node, and other parameters.
Control Words
SEND(90) transmits “n” words beginning with S (the beginning source word
for data transmission at the source node) to the “n” words beginning with D
(the beginning destination word for data reception at destination node N).
Executing SEND(90) just starts the data transmission via the Communica-
tions Unit. To check whether the transmission was actually completed, verify
that the Network Instruction Enabled Flag (AR 0209) has gone from OFF to
ON and the Network Instruction Error Flag (AR 0208) is OFF. The transmis-
sion processing is completed when END(01) is executed.
If a response is required but not received within the response monitoring time,
the data transmission will be retried until a response is received or the speci-
fied number of retries (up to 15) is reached.
Destination node N
"n" number
of send
words
n
S
15
0
n
D
15
0
Source node
C + 2
@SEND(90)
S
D
C
C
"n" number of send words
000 to 3DE (Hex): 0 to 990 words
C +1 1
Always "1"
Always "1"
0: Response required
1: Response not required
Destination node number (N)
01 to 20 (Hex): 1 to 32
The same data can be broadcast to all nodes
on the network by setting the destination node num-
ber to FF (Hex).
The range of node numbers will vary for networks
other than Controller Link Networks.
0: Destination network address not specified (local network)
1: Destination network address specified.
Response monitoring time
00 (Hex): 2 s (for 2 Mbps)
4 s (for 1 Mbps)
8 s (for 500 Kbps)
01 to FE (Hex): 0.1 to 25.4 s (unit: 0.1 s)
FF (Hex): No response monitoring
Destination unit address
00 (Hex): PC's CPU Unit
01 (Hex): Computer (user program)
10 to 1F (Hex): Unit nos. 0 to 15
FE (Hex): Unit connected to network
C + 3
0
0
Destination network address
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
This setting is enabled only when "Destination network address specified" is set in word C.
When specifying a destination network address, set all the nodes in the routing tables. For de
tails on routing tables, refer to the section on network interconnections in the
Controller Link Unit
Operation Manual (W309).
S: Source node beginning send word
D: Destination node beginning receive word
C: Source node first control data word
15 14
0
1514131211
8 7
8 7
0
15
0
15
0
Direct/Indirect
Direct/Indirect
0: Direct; 1: Indirect
Number of retries
0 to F (Hex): 0 to 15 retries
000
1
