974
Serial Communications Instructions Section 3-24
3-24-2 PROTOCOL MACRO: PMCR(260)
Purpose Calls and executes a communications sequence registered in a Serial Com-
munications Board (CS Series only) or Serial Communications Unit.
Ladder Symbol
Variations
Applicable Program Areas
Operands C1: Control Word 1 and C2: Control Word 2
The contents of the two control words are shown below.
Note Refer to Automatic Allocation of Communications Ports on page 1032 for
details on using automatic allocation of the communications port number (log-
ical port).
S: First Send Word and Send Area
The first word of the words required to send data is specified. S contains the
number of words to be sent +1 (i.e., including the S word) and send data
starts in S+1. Between 0000 and 00FA hex (0 and 250 decimal) words can be
sent.
If there is no operand specified in the execution sequence, such as a direct or
linked word, specify the constant #0000 for S. If a word address or register is
PMCR(260)
C1
C2
S
R
C1: Control word 1
C2: Control word 2
S: First send word
R: First receive word
Variations Executed Each Cycle for ON Condition PMCR(260)
Executed Once for Upward Differentiation @PMCR(260)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program
areas
Step program
areas
Subroutines Interrupt tasks
OK OK OK OK
15 8 011 37 412
C1
15 0
C2
Unit address of communications partner
CS1 CPU Bus Unit: Unit number + 10 hex
Inner Board: E1 hex (CS Series only)
Serial port number (physical port)
1 to 2 hex (1 hex: Port 1, 2 hex: Port 2)
Communications port number (logical port)
0 to 7 hex (F hex: Automatic allocation)
Communications sequence number
0000 to 03E7 hex (000 to 999 decimal)
To Next Page
Loading...
Need help?
General
