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3.3 I/O Signals for Communicating with Programmable Controller CPU
3.3.2 I/O signal details
3
SPECIFICATIONS
(4) Channel change completion flag (XB)
(a) This signal is used as an interlock condition to turn ON/OFF Channel change
request (YB) when changing the channel targeted for offset/gain setting.
(b) For offset/gain setting, refer to Section 4.6.
(5) Disconnection detection signal (XC)
(a) This signal turns ON when any input signal line in the input circuit of the
conversion-enabled channel is disconnected.
To identify the disconnected channel, check Disconnection detection flag
(Un\G49).
When this signal turns ON, conversion update for the conversion-enabled
channels stops.
(b) Measured temperature value when this signal turns ON can be selected from "Up
scale", "Down scale" or "Given value". (Refer to Section 3.2.2.)
(c) This signal turns OFF after eliminating the cause of disconnection and turning ON
Error clear request (YF).
(d) When connection is restored, the measured temperature value update is restarted
regardless of the reset of this signal.
(6) Warning output signal (XD)
(a) This signal 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 values (Un\G94 to Un\G125) in any of conversion-enabled
channels.
• This signal automatically turns OFF when the measured temperature
value returns to within the setting range for all conversion-enabled
channels. The "ALM" LED also turns off.
Offset/gain setting mode
offset/gain specification
(Un\G26, Un\G27)
Channel change completion
flag (XB)
Channel change request (YB)
Executed in Q68RD3-G
Executed in sequence program