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Built-in Analog I/O Area (XA CPU Units Only) Section 4-3
4-3 Built-in Analog I/O Area (XA CPU Units Only)
Built-in Analog Input Bits: CIO 200 to CIO 203 (4 words)
Built-in Analog Output Bits: CIO 210 to CIO 211 (2 words)
The built-in analog inputs and built-in analog outputs for XA CPU Units are
always allocated words between CIO 200 and CIO 211.
The Analog I/O Area will be cleared at the following times:
1. When the operating mode is changed between PROGRAM and RUN or
MONITOR mode (See note.)
2. When the power is cycled
3. When analog I/O memory is cleared from the CX-Programmer
4. When operation fails due to a fatal error other than one created by execut-
ing a FALS(007) instruction (Memory will be retained if operation fails due
to execution of a FALS(007) instruction.)
Note The built-in analog outputs will operate as follows when the operating mode is
switched between RUN or MONITOR mode and PROGRAM mode:
Note Control of the built-in analog outputs will temporarily stop when Memory Cas-
sette data is being transferred or verified. Therefore, if the operating mode is
switched between PROGRAM and RUN or MONITOR mode when the built-in
analog output is being used and the I/O Memory Hold Bit is set to ON to retain
analog values output externally, the values will change; the analog values out-
put externally will not be retained while Memory Cassette data is being trans-
ferred or verified. The analog output values will return to the original retained
values when the transfer or verification has been completed.
Data Allocated
words
Description
Data 1/6000
resolution
1/12000
resolution
Analog input
A/D conversion
data
CIO 200 Analog input 0 −10 to 10 V:
F448 to 0BB8
hex
Other ranges:
0000 to 1770 hex
−10 to 10 V:
E890 to 1770 hex
Other ranges:
0000 to 2EE0
hex
CIO 201 Analog input 1
CIO 202 Analog input 2
CIO 203 Analog input 3
Analog output
D/A conversion
data
CIO 210 Analog output 0
CIO 211 Analog output 1
I/O Memory Hold Bit
(A500.12)
Operation
OFF The analog output values in the words allocated in
memory will be cleared and the 0000 hex will be output
for the output refresh.
ON The analog output values in the words allocated in
memory will retain their values from right before the
operating mode was changed and the previous values
will be output for the output refresh.
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