Omron CJ1W-AD041-V1, Operation Manual

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Analog Output Functions and Operating Procedures Section 5-6
To specify the output hold function, use a Programming Device to set the DM
Area words D(m+2) to D(m+9) as shown in the following table. (See note.)
Note 1. Only D(m+2) and D(m+3) are used by the CJ1W-DA021, and only D(m+2)
to D(m+5) are used by the CJ1W-DA041.
2. For the DM word addresses, m = (unit number x 100).
3. After specifying the DM settings from a Programming Device, it will be nec-
essary to either turn the power to the PLC OFF and ON, or turn ON the
Special I/O Unit Restart Bit to transfer the contents of the DM settings to
the Special I/O Unit.
5-6-5 Output Scaling Function (CJ1W-DA08V/08C Only)
When upper and lower limits have been preset in 16-bit binary data in the
CPU Unit’s DM Area within a range of
−
32,000 to 32,000 decimal (from 8300
to 7D00 hex), analog output set values with the upper and lower limits taken
as full scale and are converted from digital to analog. (See notes 1 and 2.)
This scaling function eliminates the previous necessity of providing programs
for numeric conversion from specified units. It is only enabled, however, for a
conversion time of 1 ms and a resolution of 4,000 (and not for a conversion
time of 250
µ
s and a resolution of 8,000).
Note 1. To set the upper or lower limit to a negative number, use two’s complement.
(Set 8300 to FFF for
−
32,000 to
−
1.)
2. Addresses m = unit number × 100 are allocated in the DM Area.
3. Besides upper limit > lower limit, it is also possible to set lower limit < upper
limit. (Reverse scaling is supported.)
4. Actual D/A conversion is executed at up to
−
5% to +105% of full scale. If
values exceeding this range are set, an output setting value error will occur
and the output hold function will operate.
5. When setting upper and lower limits in the DM Area in the specified units,
be sure to make the settings in 16-bit binary data (with negative values set
as two’s complement).
6. The scaling function is enabled for only a conversion time of 1 ms and a
resolution of 4,000 (and not for a conversion time of 250
µ
s and a resolu-
tion of 8,000).
7. If the scaling upper limit equals the lower limit, or if the scaling upper limit
or lower limit is outside the range of
±
32,000, a scaling data setting error is
DM word Function Set value
D(m+2) Output 1: Output status when conversion is
stopped xx00:CLR
Output 0 or mini-
mum value of
range (–5%).
xx01:HOLD
Hold output value
prior to stop.
xx02: MAX
Output maximum
value of range
(105%).
Set any value in the left-
most bytes (xx).
D(m+3) Output 2: Output status when conversion is
stopped
D(m+4) Output 3: Output status when conversion is
stopped
D(m+5) Output 4: Output status when conversion is
stopped
D(m+6) Output 5: Output status when conversion is
stopped
D(m+7) Output 6: Output status when conversion is
stopped
D(m+8) Output 7: Output status when conversion is
stopped
D(m+9) Output 8: Output status when conversion is
stopped