Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 297

Alarm output flag (upper/lower limit)
When the FX3 allocation mode function is used, the upper/lower limit alarm can be checked.
b15 b14 b13 b12 b11 b10 b9
0 0 0 0 0 0 0
(2)
(1) 0: Normal, 1: Alarm ON
(2) b8 to b15 are fixed to 0.
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory name
Alarm output flag (upper/lower limit) (in FX3
allocation mode function)
■Alarm output flag status
• When the value is out of the range specified in the alert output upper limit value or alert output lower limit value, Alert alarm
ON (1) is stored in 'Alarm output flag' (Un\G48) corresponding to each channel.
• When an alert is detected in any channel where the D/A conversion and the alert output setting are enabled, 'Alarm output
signal' (Un\G69, b14) also turns on.
■Clearing Alarm output flag
Turn on and off 'Operating condition setting request' (Un\G70, b9) or 'Alarm output clear request' (Un\G70, b14).
Disconnection detection flag
By setting 4 to 20 mA, 0 to 20 mA, or user range (current) for the analog output range and enabling the D/A conversion, a
disconnection can be detected for each channel.
b15 b14 b13 b12 b11 b10 b9
0 0 0 0 0 0 0
(2)
(1) 0: Normal, 1: Disconnection detection
(2) b4 to b15 are fixed to 0.
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory name
Disconnection detection flag
Disconnection detection flag (in FX3 allocation
mode function)
■Status of Disconnection detection flag
• When a disconnection is detected, Disconnection detection (1) is stored in 'Disconnection detection flag' (Un\G38)
corresponding to each channel.
• When a disconnection is detected in any channel, 'Disconnection detection signal' (Un\G69, b13) turns on.
■Clearing disconnection detection flag
Even if the disconnection cause is eliminated from the disconnected state when the disconnection detection auto-clear
enable/disable setting is disabled, analog output does not restart automatically to prevent an incorrect output.
To restart analog output, perform the following. Analog output restarts according to the state of CH Output enable/disable
flag (Un\G70, b1 to 4).
• In the normal output mode
Check the CH Digital value, and then turn on and off 'Error clear request' (Un\G70, b15).
• In the wave output mode
b8 b7 b6 b5 b4 b3 b2
CH4 CH4 CH3 CH3 CH2 CH2 CH1
Upper Lower Upper Lower Upper Lower
0
limit limit limit limit limit limit
value value value value value value
(1)
CH1
39
b8 b7 b6 b5 b4 b3 b2
0 0 0 0 0 CH4 CH3 CH2
(1)
CH1
38
28
b1 b0
CH1
Upper Lower
limit limit
value value
CH2 CH3
b1 b0
CH1
CH2 CH3
CH4
CH4
APPX
Appendix 8 Buffer Memory Areas
A
295