DL205 Analog Manual, 7th Edition Rev. D
12-15
Chapter 12: F2-02DAS-1, 4-20mA 2-Channel Analog Current Output
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Write Data Example (Multiplexing)
Since all channels are multiplexed into a single data word, the control program can be setup
to determine which channel to write the data to. Since the module appears as Y output points
to the CPU, it is simple to use the channel selection outputs to determine which channel to
update.
Note, this example is for a module installed in slot 3, as shown in the previous examples. The
addresses used would be different if the module was used in a different slot. These rungs can
be placed anywhere in the program or if stage programming is being used, place them in a
stage that is always active.
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. This multiplexing example
can be used with all of the DL205 CPUs.
NOTE:
Binary data must be sent to the output module. If the data is already in binary format,do not use the BIN instruction
shown in this example.
OUT
Y41
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.
BIN
Convert the data to binary (you must omit this
step if you have converted the data elsewhere).
SP1 is always on.
OUT
V40501
LD
V2000
SP7
LD
V2002
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
Y40
SP7
Select the channel to update.
Selects channel 2 for update when Y41 is OFF
(Y40--ON deselects channel 1). Note, Y40 and Y41
are used as in the previous examples. If the module
was installed in a different I/O arrangement the
addresses would be different.
Selects channel 1 for update when Y41 is OFF
(Y41--ON deselects channel 2). Note, Y40 and
Y41 are used as in the previous examples. If the
module was installed in a different I/O arrangement
the addresses would be different.
Note: Use LD if using binary, and use LDD if using BCD.
Note: Use LD if using binary, and use LDD if using BCD.
Summary of Contents for DL205
Page 1: ...DL205 Analog I O Manual Manual Number D2 ANLG M ...
Page 2: ...Notes ...
Page 6: ...Notes ...