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MELSEC-Q
3 SPECIFICATIONS
3.2.2 Analog output HOLD/CLEAR function
(1) For the case where the programmable controller CPU is placed in STOP or in a
stop error status, whether to hold (HOLD) or clear (CLEAR) the analog output
value can be set.
(2) Set the HOLD/CLEAR in "Switch 3" (HOLD/CLEAR function setting) cell of
Switch setting for I/O and intelligent function module dialog box. (Refer to Section
4.5 (1))
(3) Depending on combinations of the HOLD/CLEAR setting, D/A conversion
enable/disable setting, and CH Output enable/disable flag (Y1 to Y8), the
analog out-put status varies as shown in Table 3.4.
Table 3.4 Analog output status combination list
Setting
combination
execution
status
D/A conversion enable/disable
(buffer memory address 0: Un\G0)
Enable Disable
CH Output enable/disable flags (Y1 to Y8) Enable Disable Enable or disable
HOLD/CLEAR setting HOLD CLEAR HOLD or CLEAR HOLD or CLEAR
Analog output status when programmable controller CPU is
RUN
Outputs the analog value of the
D/A converted digital value.
Offset 0 V/0 mA
Analog output status when programmable controller CPU is
STOP
Hold Offset Offset 0 V/0 mA
Analog output status when a programmable controller CPU
stop error occurs
Hold Offset Offset 0 V/0 mA
Analog output status when a watchdog timer error
1
occurs
in D/A converter module
0 V/0 mA 0 V/0 mA 0 V/0 mA 0 V/0 mA
1 This occurs when program operations are not completed within the scheduled time due to a hardware
problem of the D/A converter module. When a watchdog timer error occurs, Module ready (X0) turns off
and the D/A converter module RUN LED turns off.
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