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3. SPECIFICATIONS MELSEC-A
3-8
3.4 Various Functions to Control the Analog Output
Various functions to control the analog output of the AJ65BT-64DAV/DAI are explained.
3.4.1 Function to specify hold or clear of the analog output when the
programmable controller CPU is in the STOP status (HOLD/CLEAR
setting)
Using this function, the HLD/CLR terminal on the module front panel can be used to set whether to
retain or clear (i.e. to output the offset) the analog output value immediately before the programmable
controller CPU enters the STOP status or before the AJ65BT-64DAV/DAI stops the D/A conversion
due to an error. All channels are set simultaneously. (Including a time when link communications are
shut off)
3.4.2 Function to specify executing or not executing the D/A conversion
processing (Analog output enable/disable flag)
Using this function, whether to output the D/A conversion value or the offset value can be selected for
each channel by turning on or off the Analog output enable/disable flag from the programmable
controller program.
However, the D/A conversion time (conversion speed) is constant regardless of the setting of the
Analog output enable/disable flag.
ON: D/A conversion value OFF: Offset value
3.4.3 Function to specify enabling or prohibiting of the analog value external
output (Analog output enable/prohibit setting)
Using this function, whether to enable or prohibit the external output of the analog signal can be
specified for each channel by writing "0" or "1" to the remote register's address from the
programmable controller program.
1: 0V/0mA 0: D/A conversion value or offset value
3.4.4 Offset/gain setting
When a fine I/O conversion characteristic is required, the I/O conversion characteristics can be
modified arbitrarily by setting the offset and gain of each channel without a volume control, after
entering the test mode by short-circuiting the test mode terminal. When it is not necessary, turning
on the RYn4, which is the I/O signal to the master station, selects the factory-configured offset and
gain values.
Factory-configured values:
AJ65BT-64DAV........Offset value 0V, Gain value 10V
AJ65BT-64DAI......... Offset value 4mA, Gain value 20mA
3.4.5 Combinations of various functions
By combining the functions explained above, the analog output when the programmable controller
CPU is in the RUN status and when a module error occurs can be set as desired, as shown in Table
3.3.
Select each function depending on the analog output status of your choice.