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Chapter 2 Front-Panel Operation
To Use a Digital I/O Port
2
Writing to a Digital I/O Port
You can write data to the built-in digital I/O port (numbered 090) or to
one of the built-in digital I/O port bits (numbered 091 through 094), or
any one of the 8-bit ports on a digital I/O or multifunction module (with a
DIO function). To write to a port:
1. Select a digital I/O port. Use the knob to select the slot and channel
number. The channel number is in the form of snn, where s is the slot
number and nn is the channel number. In the display, “DIN”
indicates that the last operation on the port was a READ, and
“DOUT”, a WRITE.
2. Press the Write key. “DOUT” is displayed to indicate the port is now
an output port. The current port value is displayed.
3. Edit the value. Use the arrow keys to select the to-be-edited bit (the
digit to be edited is set to half bright in the display).
Turn the knob to modify the value. Use the arrow keys to select the
next digit and the knob to modify its value.
4. When the value is the one desired, press Enter to output the data to
the selected port.
5. Press Write again to cancel the current write operation.
Note Data display format of individual 8-bit ports can be specified either in
binary or decimal values (refer to the procedure on page 34). Once
specified, the format applies to all input and output operations on the
same port.
DIN
401
DOUT 401255
DOUT 401254
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