871
Network Instructions Section 3-24
Operands C: First control word
The five control words C to C+4 specify the number of words to be received,
the source of the transmission, 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 source network address to 00 to specify a source within the local
network. 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 receive data from a host com-
puter through a serial port with the host link while initiating communica-
tions from the PLC.
(a) Set the source unit address (bits 00 to 07 of C+2) to the unit ad-
dress of the CP-series CPU Unit or the 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 source 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.
CP1H CPU Unit and CP1L M (30 or 40 I/O points) CPU Unit Se-
rial Communications Option Board Ports
Word Bits 00 to 07 Bits 08 to 15
C
Number of words: 0001 to maximum allowed
1
(4-digit hexadecimal)
C+1 Source network address:
00 to 7F (0 to 127)
2, 4
Bits 08 to 11:Serial port number
(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
Source unit address
5
Source node address:
00 to maximum allowed
6
C+3 No. of retries: 00 to 0F (0 to 15) Port number: 00 to 07
(F: Automatic allocation)
7
Response is fixed to “required.”
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 CPU Unit 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
Port Port’s unit address
Port 1 FD hex (253 decimal)
Port 2 FC hex (252 decimal)
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