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3-1-1 Normal I/O Operation
When pin 2 of the back panel DIP switch is OFF, data is transferred through 2
words allocated for I/O. If pin 2 is OFF, data cannot be not transferred to and from
the Ladder Program I/O Unit using the I/O WRITE and I/O READ
(WRIT(87)/READ(88)) instructions from the PC.
The output bit data in PC word n (the first word allocated to the Unit by the PC) is
input to word 00 in the Ladder Program I/O Unit. The bits of word 00 are treated
as input bits when programming the Ladder Program I/O Unit.
The input bit data in PC word n+1 is output from word 01 in the Ladder Program
I/O Unit. The bits of word 01 are treated as output bits when programming the
Ladder Program I/O Unit.
PC Word Allocation
Unit Word Allocation
Bit No.
IR n
IR n+1
Bit No.
Word 00
Word 01
Output
Input
Input
Output
00
Output bit 00
Input bit 00
00
Input bit 00
Output bit 00
01
Output bit 01
Input bit 01
01
Input bit 01
Output bit 01
02
Output bit 02
Input bit 02
02
Input bit 02
Output bit 02
03
Output bit 03
Input bit 03
03
Input bit 03
Output bit 03
04
Output bit 04
Input bit 04
04
Input bit 04
Output bit 04
05
Output bit 05
Input bit 05
05
Input bit 05
Output bit 05
06
Output bit 06
Input bit 06
06
Input bit 06
Output bit 06
07
Output bit 07
Input bit 07
07
Input bit 07
Output bit 07
08
Output bit 08
Input bit 08
08
Input bit 08
Output bit 08
09
Output bit 09
Input bit 09
09
Input bit 09
Output bit 09
10
Output bit 10
Input bit 10
10
Input bit 10
Output bit 10
11
Output bit 11
Input bit 11
11
Input bit 11
Output bit 11
12
Output bit 12
Input bit 12
12
Input bit 12
Output bit 12
13
Output bit 13
Input bit 13
13
Input bit 13
Output bit 13
14
Output bit 14
Input bit 14
14
Input bit 14
Output bit 14
15
Output bit 15
Input bit 15
15
Input bit 15
Output bit 15
"# $" #% &
Section 3-1
Summary of Contents for C500-LDP01-V1
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