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Analog Output Functions and Operating Procedures Section 5-6
5-6-2 Conversion Time/Resolution Setting (CJ1W-DA08V/08C Only)
This setting is supported only by version-1 Units.
Bits 08 to 15 in DM word m+18 can be used to set the conversion time and
resolution for the CJ1W-AD08V/08C to increase speed and accuracy.
This setting applies to analog outputs 1 to 8, i.e., there are not individual set-
tings for each input.
Note After making the DM settings from a Programming Device, it will be necessary
to either turn the power to the PLC OFF and ON, or turn ON the Special I/O
Unit Restart Bit in order to transfer the contents of the DM settings to the Spe-
cial I/O Unit.
5-6-3 Starting and Stopping Conversion
To begin analog output conversion, turn ON the corresponding Conversion
Enable Bit (word n, bits 00 to 03) from the user’s program.
Note 1. For the CIO word addresses, n = CIO 2000 + (unit number x 10).
2. The analog output when conversion is stopped will differ depending on the
output signal range setting and output hold setting. Refer to 5-6-1 Output
Settings and Conversions and 5-6-4 Output Hold Function.
3. Conversion will not begin under the following conditions even if the Con-
version Enable Bit is turned ON. Refer to 5-6-4 Output Hold Function.
• In adjustment mode, when something other than the output number is
output during adjustment.
• When there is an output setting error.
• When a fatal error occurs at the PLC.
4. When the operation mode for the CPU Unit is changed from RUN or MON-
ITOR mode to PROGRAM mode, or when the power is turned ON, the
Conversion Enable Bits will all turn OFF. The output status at this time de-
pends on the output hold function.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
D(m+18)
00: Conversion time = 1 ms, resolution = 4,000
C1: Conversion time = 250
µs, resolution = 8,000
(m = D20000 + unit number x 100)
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
Output 2
Output 1
Word n
Output 4
Output 3
Only outputs 1 and 2 are used
by the CJ1W-DA021.
Only outputs 1 to 4 are used
by the CJ1W-DA041.
Output 6
Output 5
Output 8
Output 7
Analog conversion is executed while
these bits are ON. When the bits are
turned OFF, the conversion is stopped
and the output data is held.
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