Analog Output Test When Cpu Module Is In Stop Status Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.6
Analog Output Test when CPU Module is in STOP
Status Function
Analog output tests can be carried out when the CPU module is in the STOP status.
The following functions are enabled during the analog output test.
• Scaling function (Page 23 Scaling Function)
• Shift function (Page 26 Shift Function)
• Alert output function (Page 28 Alert Output Function)
When a digital value that is out of the setting range is written, a digital value setting range error (error code: 191H) occurs
and the corresponding check code is stored in 'CH1 Setting value check code' (Un\G400).
Operation
By forcibly turning on 'CH1 Output enable/disable flag' (Y1) when the CPU module is in the STOP state, the analog output
value is changed from the offset value to the D/A-converted analog output value.
The following figure shows the relation between 'CH1 Output enable/disable flag' (Y1) and the analog output value of the CPU
module in the STOP state when the analog output HOLD/CLEAR setting is set to CLEAR (0).
CPU module
status
CH1 Output
enable/disable
flag (Y1)
Analog output
Analog output value
value status converted from digital value
*1 'CH1 Output enable/disable flag' (Y1) turns off when the status of the CPU module is changed into STOP.
*2 By forcibly turning on 'CH1 Output enable/disable flag' (Y1), the analog output value is changed from the offset value to the D/A-
converted analog output value.
Setting procedure
To perform an analog output test, configure the settings in the device test of the engineering tool following the procedure
shown below.
1.
Set 'CH1 D/A conversion enable/disable setting' (Un\G500) of the buffer memory to D/A conversion enabled (0).
2.
Turn on 'Operating condition setting request' (Y9).
3.
Check that 'Operating condition setting completed flag' (X9) turns off, and turn off 'Operating condition setting request'
(Y9).
4.
Set the digital value equivalent to the analog value to be output for 'CH1 Digital value' (Un\G460) in the buffer memory.
5.
Turn on 'CH1 Output enable/disable flag' (Y1).
1 FUNCTIONS
22

1.6 Analog Output Test when CPU Module is in STOP Status Function

D/A-converted value is output even when the CPU module is in STOP status.
RUN
*1
OFF
Offset value
Controlled by the D/A converter module
STOP
*2
ON
OFF
Analog output value
Offset value
converted from digital value
RUN
ON
Analog output value
converted from digital value