Mitsubishi MELSEC iQ-F, User Manual

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APPX
Appendix 4 Buffer Memory Areas
123
A
Warning output flag (Process alarm lower limit)
The lower limit alarm of the process alarm can be checked for each channel.
■
Buffer memory address
The following shows the buffer memory address of this area.
■ Alert output flag status
• If the limit specified by the process alarm lower lower limit value is equal to or exceeded, Alarm ON (1) is stored in 'Alert
output flag (Process alarm lower limit)' (Un\G37) of the corresponding channel.
• If an alert is detected even in one channel, of the channels where conversion is enabled and the alert output setting
(Process alarm) is enabled, 'Alert output signal' (Un\G69, b8) also turns on.
■
Clearing Alert output flag
• When the digital operation value becomes greater than the process alarm lower upper limit value, the flag is automatically
cleared.
• Turning off
→
on
→
off 'Operating condition setting request' (Un\G70, b9) allows the flag to be cleared.
Warning output flag (Process alarm upper limit/lower limit) [FX2N allocation mode]
When the FX2N allocation mode function is used, the upper/lower limit alarm of the process alarm can be checked.
■ Buffer memory address
The following shows the buffer memory address of this area.
■
Alert output flag status
• When the value is out of the range specified in the process alarm upper upper limit value or process alarm lower lower limit
value, Alarm ON (1) is stored in Alert output flag (Process alarm upper limit/lower limit) corresponding to each channel.
• If an alert is detected even in one channel, of the channels where conversion is enabled and the alert output setting
(Process alarm) is enabled, 'Alert output signal' (Un\G69, b8) also turns on.
■ Clearing Alert output flag
• When the digital operation value falls within the process alarm upper lower limit value or less, or process alarm lower upper
limit value or more, the flag is automatically cleared.
• Turning off
→
on
→
off 'Operating condition setting request' (Un\G70, b9) allows the flag to be cleared.
(1) 0: Normal, 1: Alarm ON
(2) The values of b8 to b15 are fixed to 0.
Buffer memory name CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
Warning output flag (Process alarm lower limit) 37
(1) 0: Normal, 1: Alarm ON
Buffer memory name CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
Alert output flag (Process alarm) (in FX2N allocation mode
function) 26
0 0 0 0 0 0 0 0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b0 b1 b2 b3 b4
(1) (2)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b0 b1 b2 b3 b4
CH1 CH2 CH1 CH2 CH3 CH4 CH4 CH3 CH5 CH6 CH5 CH6 CH7 CH8 CH8 CH7
(1)
Lower limit value Upper limit value Lower limit value Lower limit value Lower limit value Lower limit value Lower limit value Lower limit value Lower limit value Upper limit value Upper limit value Upper limit value Upper limit value Upper limit value Upper limit value Upper limit value