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3.3 I/O Signals Transferred to/from Programmable Controller CPU
3.3.2 I/O signal details
3
SPECIFICATIONS
(7) Warning output signal (XD)
(a) The warning output signal (XD) turns ON when a process alarm or rate alarm is
detected.
1) Process alarm
• This signal turns ON when the process alarm is enabled and a measured
temperature value exceeds the preset range of the process alarm upper/
lower limit value (Un\G94 to Un\G125) in a conversion-enabled channel.
• For every conversion-enabled channel, the signal automatically turns OFF
when the measured temperature value returns to within the setting range,
and the "ALM" LED also turns off.
2) Rate alarm
• This signal turns ON when the rate alarm is enabled and the change of
measured temperature value exceeds the preset range of the rate alarm
upper/lower limit value (Un\G134 to Un\G149) in a conversion-enabled
channel.
• For every conversion-enabled channel, the signal automatically turns OFF
when the change of measured temperature values return to within the
setting range, and the "ALM" LED also turns off.
Figure 3.17 On or off for warning output signal (XD)
Executed in Q68TD-G-H02(H01)
Warning output flag
(Un\G47, Un\G48)
Warning output
signal (XD)
0
0
Warning occurrence
(process alarm, rate alarm)