865
Network Instructions Section 3-24
Applicable Program Areas
Operands C: First control word
The five control words C to C+4 specify the number of words being transmit-
ted, the destination, and other settings shown in the following table.
Note (1) The maximum number of words allowed depends on the network being
used. For a Controller Link, the allowed range is 0001 to 03DE (1 to 990
words).
(2) Set the destination network address to 00 to transmit within the local net-
work. When two or more CPU Bus Units are mounted, the network ad-
dress will be the unit number of the Unit with the lowest unit number.
(3) The following two methods can be used to send data to the host computer
through a serial port with the host link while initiating communications
from the PLC.
(a) Set the destination unit address (bits 00 to 07 of C+2) to the unit
address of the CPU Unit or CJ-series Serial Communications
Unit and set the serial port number (bits 08 to 11 of C+1) to 1 for
port 1 or 2 for port 2.
(b) Set the destination unit address directly into bits 00 to 07 of C+2.
In this case, set the serial port number in bits 08 to 11 of C+1 to
0 for direct specification.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Word Bits 00 to 07 Bits 08 to 15
C
Number of words: 0001 to maximum allowed
1
(4-digit hexadecimal)
C+1 Destination network address:
00 to 7F (0 to 127)
2, 4
Bits 08 to 11:Serial port number
3
(physical port)
1 hex: Port 1
2 hex: Port 2
(Do not set 0, 3, or 4.)
Bits 12 to 15: Always 0.
C+2
Destination unit address: 00 to FE
5
Destination node address:
00 to maximum allowed
6
C+3 No. of retries: 00 to 0F (0 to 15) Bits 08 to 11:
Communications port number (inter-
nal logic port): 0 to 7, Automatic allo-
cation: F
7
Bits 12 to 15: Response setting
0: Response requested.
8: No response requested.
8
C+4 Response monitoring time: 0001 to FFFF (0.1 to 6553.5 seconds)
(The default setting of 0000 sets a monitoring time of 2 seconds.)
Unit address
(C+2, bits 00
to 07)
Unit Serial port number
(C+1, bits 08 to 11)
Serial port
00 hex CP1H with Serial Com-
munications Option
Board mounted
1 hex Port 1
2 hex Port 2
10 hex + unit
number
CJ-series Serial Com-
munications Unit (CPU
Bus Unit)
1 hex Port 1
2 hex Port 2
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