Mitsubishi QD60P8-G - Alarm Output Function

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MELSEC-Q
5 DETAILS AND SETTING OF FUNCTIONS
5.8 Alarm Output Function
With "alarm output function valid" set in the "alarm output selection" of the
buffer memory, the alarm output function outputs an alarm if the "sampling
pulse number" of the buffer memory exceeds the upper/upper limit value or
lower/lower limit value. The alarm is turned OFF if the sampling pulse number
is below the upper/lower limit value or above the lower/upper limit value after
the output of the alarm.
To set the alarm output function, set four points: upper/upper limit value,
upper/lower limit value, lower/upper limit value and lower/lower limit value.
The buffer memory addresses related to the setting of the alarm output
function are as follows.
Buffer memory address
Item Setting value
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
Alarm output selection
0: Alarm output function
invalid
1: Alarm output function
valid
17 49 81 113 145 177 209 241
Alarm output setting value
upper/upper limit
19 51 83 115 147 179 211 243
Alarm output setting value
upper/lower limit
20 52 84 116 148 180 212 244
Alarm output setting value
lower/upper limit
21 53 85 117 149 181 213 245
Alarm output setting value
lower/lower limit
0 to 32767
22 54 86 118 150 182 214 246
If the setting value is other than in the above values or does not establish the following
relation expression, an alarm output setting range outside error (error code: 500)
occurs.
Upper/upper limit
upper/lower limit lower/upper limit lower/lower limit
To clear the error, turn ON the error reset request (Y8 to YF) of the corresponding
channel.
After this, set a correct value (value that will establish the above relation expression
and is within the setting range), and then turn ON the operating condition setting
request flag (Y1).
The buffer memory addresses related to the alarm output are as follows.
Buffer memory address
Item Read value
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
Sampling pulse number 0 to 32767 0 32 64 96 128 160 192 224
Alarm output flag
bit0: Lower limit alarm
bit8: Upper limit alarm
18 50 82 114 146 178 210 242
[Bit pattern of alarm output]
Not usedNot used
b15 b0b4b8
0:OFF(Normal)
1:ON(Range over)
Meaning
Lower limit alarm
Upper limit alarm
Storage Item