Omron CS1W-LC001 Operation Manual page 131

Section 3-2
Description of Operation
When isolated-type Control Output Unit CS1W-PMV01 is used
Isolated-type Control Output Units do not have a Conversion Enable flag.
Disabling of conversion is indicated by the setting of the allocated Data
Memory area. As the default setting, conversion is executed, and analog
output values are refreshed and output. Conversion is executed at all times
as long as it is not disabled by this allocated Data Memory area (except by a
CPU Unit fatal error).
However, when the CPU Unit changes to the PROGRAM mode, the analog
output value momentarily (operation cycle of Loop Control Unit) turns OFF,
and as a result, the analog output value is momentarily switched to the lower
limit (minimum) value.
To prevent the analog output value from being switched to the lower limit
(minimum) value when the CPU Unit changes to the PROGRAM mode, set
the I/O Memory Hold flag (A50012) of the CPU Unit to ON, and set "Hold
ON/OFF of I/O Memory Hold flag at power ON" to ON in the PC system
settings.
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