Analog Output Hold/Clear Function - Mitsubishi MELSEC-Q Q62DAN User Manual

3 SPECIFICATIONS

3.2.2 Analog output HOLD/CLEAR function

D/A conversion enable/disable
Setting
Setting (buffer memory address 0: Un\G0)
combination
CH output enable/disable flags (Y1 to Y8)
execution
status
HOLD/CLEAR setting
Analog output status when programmable controller CPU is
RUN
Analog output status when programmable controller CPU is
STOP
Analog output status when a programmable controller CPU
stop error occurs
Analog output status when a watchdog timer error
in D/A converter module
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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(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) Make the setting in the HOLD/CLEAR setting (Refer to Section 4.5(1)). of the
intelligent function module switch.
(3) Depending on combinations of the HOLD/CLEAR setting, D/A conversion
enable/disable setting (Un\G0), 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
1
occurs
POINT
The following conditions should be satisfied when the analog output HOLD/CLEAR
function is used on a MELSECNET/H remote I/O station.
• The master module of function version D or later and the remote I/O module of
function version D or later are required.
• Validate the station unit block guarantee of the send side cyclic data.
• The setting for holding the D/A converter module output in the case of a link error
must be made in the "Error time output mode in the I/O assignment setting".
(Refer to Section 4.5 (2).) The HOLD/CLEAR setting by the intelligent function
module switch is invalid.
This setting is validated on a per-module basis, and is not made on a per-
channel basis. Therefore, to make the output status at a stop error or STOP of
the programmable controller CPU matched with the output status at a link error,
set the same HOLD/CLEAR setting to all channels. (Refer to the table below.)
Hold analog output
Clear analog output
(Output offset value)
For the station unit block guarantee of the cyclic data, refer to the Q
Corresponding MELSECNET/H Network System Reference Manual (Remote I/O
Network).
Enable
Enable
HOLD CLEAR
Outputs the analog value of the
D/A converted digital value.
Hold Offset
Hold Offset
0 V/0 mA 0 V/0 mA
Error time output mode
Hold
Clear
MELSEC-Q
Disable
Disable Enable or disable
HOLD or CLEAR HOLD or CLEAR
Offset 0 V/0 mA
Offset 0 V/0 mA
Offset 0 V/0 mA
0 V/0 mA 0 V/0 mA
HOLD/CLEAR setting
(Same setting to all channels)
HOLD
CLEAR
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