DL205 Analog Manual, 7th Edition Rev. D
9-20
Chapter 9: F2-02DA-2, F2-02DA-2L, 2-Channel Analog Voltage Output
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Writing Data (Multiplexing)
The DL230 CPU does not have the special V-memory locations that allows for automatic
enabling the data transfer. Since all channels are multiplexed into a single data word, the
control program must be written in such a way to determine which channel to write the data
to. Since the module appears as Y output points to the CPU, it is very easy to use the channel
selection outputs to determine which channel to update.
The following example is for a module installed as shown in previous examples. The addresses
used would be different if the module were located in a different slot. These rungs can be
placed anywhere in the user program or, if using stage programming, placed in an active stage.
This example is a two-channel multiplexer that updates each channel on alternate scans. Relay
SP7 is a special relay that is on for one scan, then off for one scan. A permissive contact on the
last rung handles an embedded sign bit.
NOTE:
Use binary data to write to the module outputs. Do not use a BIN instruction if the data is already in binary format.
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OUT
Y35
Loads the data for channel 1 into the accumulator.
Load data into the accumulator.
SP7
SP1
Send data to V-memory assigned to the module.
ANDD
K7FFF
Remove sign bit for BCD to binary conversion. SP1 is
always on.
OUT
V40501
LD
V2000
SP7
LD
V2001
Loads the data for channel 2 into the accumulator.
The OUT instruction sends the data to the
module. Our example starts with V40501 but the
actual value depends on the location of the
module in your application.
SP7
OUT
Y34
SP7
Select the channel to update.
Selects channel 1 for update when Y34 is OFF
(Y35--ON deselects channel 2). Note, Y34 and Y35
are used due to the previous examples. If the
module was installed in a different I/O
arrangement, the addresses would be different.
Selects channel 2 for update when Y35 is OFF
(Y34--ON deselects channel 1). Note, Y34 and Y35
are used due to the previous examples. If the
module was installed in a different I/O arrangement,
the addresses would be different.
OUT
Y37
SP7
SP7
V2000
V2001
K8000
K8000
If the output format is --2047 to +2047, include this
rung to embed the sign bit. For the output format 0 to
4095, omit this rung.
BIN
Convert the data to binary (you must omit this step if you
have converted the data elsewhere).
≥
≥
Summary of Contents for DL205
Page 1: ...DL205 Analog I O Manual Manual Number D2 ANLG M ...
Page 2: ...Notes ...
Page 6: ...Notes ...