Omron CS1W-LC001 Operation Manual page 130

Description of Operation
112
Note 2 Field Terminals that do not undergo writing by the Loop Control Unit
Model Function block
name
551 AI 8-point
Terminal (AD003)
561 AI 4-point
Terminal
(PTS01/02/03,
PDC01, PTW01)
562 AI 4-point
Terminal
(PPS01)
564 AI 8-point
Terminal
(PTR01/02)
584 AI 8-point
Terminal (AD081)
586 AI 4-point
Terminal (AD041)
When Analog Output Units C200H-DA003/004, CS1W-DA08V/C or
CS1W-DA041 and Analog Input/Output Unit C200H-MAD01 or CS1W-
MAD44 are used
When the operation mode of the CPU Unit changes from RUN or MONITOR
to PROGRAM, the Conversion Enable flag of the Analog Output Unit and the
Analog Input/Output Unit is turned OFF from the CPU Unit, and the output
hold function holds analog output values at the previous value, minimum
value or maximum value.
The Loop Control Unit forcibly turns this Conversion Enable flag ON when the
Unit is in use.
However, when the CPU Unit changes to the PROGRAM mode, the
Conversion Enable flag momentarily (operation cycle of Loop Control Unit)
turns OFF, and as a result the analog output value is momentarily switched to
the momentary output hold value.
To prevent the analog output value from being switched to the momentary
output hold 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.
Target Analog Internal writing by
Input/Output Unit Loop Control Unit
C200H-AD003 None
CS1W-PTS01
(isolated-type
thermocouple
input), CS1W-
PTS02/03
(isolated-type
temperature-
resistance
thermometer),
CS1W-PDC01
(isolated-type
analog input),
CS1W-PTW01
(2-wire
transmitter input)
CS1W-PPS01
(isolated-type
pulse input)
CS1W-PTR01
(Power
Transducer Input
Unit), CS1W-
PTR02 (analog
input 100 mV)
CS1W-AD081
CS1W-AD041
Section 3-2
Writing of
analog
values
None