Omron CP1L - 12-2007, Operation Manual

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I/O Area and I/O Allocations
Section 4-2
Units with 8 Output Points (CP1W-16ER/CPM1A-16ER)
Sixteen output bits in two words are allocated in one word (bits 00 to 07 in CIO
n and bits 00 to 07 in CIO n+1). Eight output bits are allocated in one word
(bits 00 to 07 in CIO n+1).
Two words (16 bits) are allocated to a 16-output Expansion Output Unit. No
input words are allocated. Output bits 08 to 15 can be used as work bits.
Units with 20 I/O Points (CPM1A-20ED
@@
/20EDT/20ED
@@
)
Twelve input bits are allocated in one word (bits 00 to 11 in CIO m). Eight out-
put bits are allocated in one word (bits 00 to 07 in CIO n).
One input word (12 bits) and one output word (8 bits) are allocated for a 20-
point Expansion I/O Unit.
Input bits 12 to 15 are always cleared by the system and cannot be used as
work bits. Output bits 08 to 15, however, can be used as work bits.
Units with 40 I/O Points (CPM1A-40ED
@@
/40EDT/40ED
@@
)
Twenty-four input bits in two words are allocated (bits 00 to 11 in CIO m and
bits 00 to 11 CIO m+1). Sixteen output bits in two words are allocated (bits 00
to 07 in CIO n and bits 00 to 07 in CIO n+1).
Two input words (24 bits) and two output words (16 bits) are allocated to a 40-
point Expansion I/O Unit. Input bits 12 to 15 cannot be used as work bits. Out-
put bits 08 to 15, however, can be used as work bits.
4-2-3 I/O Allocation Examples with Expansion I/O Units
Example 1: Maximum I/O Capacity
The configuration shown in this example is for the maximum I/O capacity. It
consists of a CPU Unit with 40 I/O points and three Expansion I/O Units, each
with 40 I/O points. Up to three Expansion I/O Units can be connected to a
CPU Unit with either 30 or 40 I/O points.
When Expansion I/O Units with 40 I/O points are connected, control is possi-
ble for up to 160 I/O points, including 96 inputs and 64 outputs.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
n
n+1
Output
bits
Can be used as work bits.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
n
Do not use.
Can be used as work bits.
Output bits
Input bits
m
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
m
m+1
Do not use.
n
n+1
Can be used as work bits.
Input
bits
Output
bits