1045
Network Instructions Section 3-25
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 address
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 ad-
dress of the CPU Unit or Serial Communications Unit/Board and set
the serial port number (bits 08 to 11 of C+1) to 1 for port 1 or 2 for port
2.
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 CPU Unit 1 hex Built-in RS-
232C port
2 hex Peripheral
port
10 hex + unit
number
Serial Communications
Unit (CPU Bus Unit)
1 hex Port 1
2 hex Port 2
E1 hex Serial Communications
Board (Inner Board)
(CS Series only)
1 hex Port 1
2 hex Port 2
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