Omron CP1L-EL20DR-D, Operation Manual

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I/O Area and I/O Allocations Section 4-2
Auxiliary Area Flags and Words
PLC Setup
4-2 I/O Area and I/O Allocations
Input Bits: CIO 0.00 to CIO 99.15 (100 words)
Output Bits: CIO 100.00 to CIO 199.15 (100 words)
The starting words for inputs and outputs are predetermined for CP1L-EL/EM
CPU Unit. Input bits in CIO 0 and CIO 1 and output bits in CIO 100 and CIO
101 are automatically allocated to the built-in I/O on the CPU Unit. CP-series
Expansion Units and CP-series Expansion I/O Units are automatically allo-
cated input bits in words starting from CIO 2 and output bits in words starting
from CIO 102.
• Allocated Words and Number of Expansion Units and Expansion I/O
Units
For example, with a CPU Unit with 40 I/O points, the input bits in CIO 0 and
CIO 1 and the outputs bits in CIO 100 and CIO 101 would be allocated to the
built-in I/O of the CPU Unit. Input bits in CIO 2 and higher and outputs bits in
CIO 102 and higher would be automatically allocated in order to any Expan-
sion Units or Expansion I/O Units connected to the CPU Unit.
When the power to the CPU Unit is turned ON, the CPU Unit checks for any
Expansion Units and Expansion I/O Units connected to it and automatically
allocates I/O bits. If the order in which the Units are connected is changed, the
the bits used in the ladder program will no longer match the bits allocated to
the actual Units. Always review the ladder program whenever changing the
order in which Units are connected.
Name Address Description
IOM Hold Bit A500.12 Specifies whether the I/O memory will be retained or
not when the CPU Unit operating mode is changed
(between PROGRAM and RUN/MONITOR) or when
the power is cycled.
OFF: I/O memory is cleared to 0 when the operating
mode is changed.
ON: I/O memory is retained when the operating
mode is changed between PROGRAM and
RUN or MONITOR.
Name Description Setting Default
IOM Hold
Bit Status
at Startup To retain all data in I/O
memory when the PLC
is turned ON, set the
IOM Hold Bit at startup
parameter to hold the
status of the I/O Hold Bit.
OFF: The IOM Hold Bit is cleared
to 0 when power is cycled.
ON: The status of the IOM Hold
Bit is retained when power is
cycled.
OFF
(Cleared)
CPU Unit Allocated words Number of
Expansion Units
and Expansion I/O
Units connected
Input bits Output bits
CPU Unit with
20 I/O points CIO 0 CIO 100 1
CPU Unit with
30 I/O points CIO 0 and CIO 1 CIO 100 and CIO 101 3
CPU Unit with
40 I/O points CIO 0 and CIO 1 CIO 100 and CIO 101 3