Omron SYSMAC C20P Operation Manual page 28

IR Area
I/O Bits Available in Special
I/O Units
PC Configuration and I/O
Word Allocation
The following table shows which bits are allocated to each of the Special I/O
Units. Bits in the shaded areas can be used as work bits but not as output
bits. The word addresses depend on the Unit(s) that the Special I/O Unit is
coupled to. In all cases the first Special I/O Unit address for input and output
words is one more than the last address for input and output words used by
the Unit to which the Special I/O Unit is attached. For example, if the last
word address was IR 03, the first input or output word address for the Special
I/O Units will be IR 04. In the tables below "n" is the word allocated prior to
the Special I/O Unit.
Model Input bits Output bits
IR (n + 1)
00
01
02
Cannot
be
03
used
C1K–AD
04
05
06
07
IR (n + 1)
00 08
01 09
02 10
C4K–AD
03 11
04 12
05 13
06 14
07 15
IR (n + 1)
Cannot
C1K–DA
be used
IR (n + 1)
00 08
01 09
02 10
03 11
C20–LK
04 12
011(–P)
05 13
06 14
07 15
IR (n + 1)
00
01
02
C4K–TM
03
Cannot
be used
A P-type PC consists of a CPU Unit plus one or more of the following Units:
Expansion I/O Units, Analog Timer Units, Analog I/O Units, or an I/O Link
Unit. All of these Units are connected in series with the CPU Unit at one end.
An I/O Link Unit, if included, must be on the other end (meaning only one I/O
IR (n + 6)
00 08
01 09
02 10
03 11
04 12
05 13
06 14
07 15
IR (n + 6)
00 08
01 09
02 10
03 11
04 12
05 13
06 14
07 15
IR (n + 6)
00 08
01 09
02 10
03 11
04 12
05 13
06 14
07 15
IR (n + 6)
00 08
01 09
02 10
03 11
04 12
05 13
06 14
07 15
IR (n + 6)
00 08
01 09
02 10
03 11
04 12
05 13
06
14
07 15
Section 3–3
19