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3
SPECIFICATIONS
3.3 I/O Signals Transferred to/from Programmable Controller CPU
3.3.2 I/O signal details
3 - 25
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
SETUP AND
PROCEDURES BEFORE
OPERATION
5
UTILITY PACKAGE (GX
CONFIGURATOR-TI)
6
PROGRAMMING
7
ONLINE MODULE
CHANGE
8
TROUBLESHOOTING
(4) Channel change completion flag (XB)
(a) This signal is used as an interlock condition to turn ON/OFF the channel change
request (YB) when changing the channel for the offset/gain setting.
(b) For offset/gain setting, refer to Section 4.6.
Figure 3.16 Channel change completion flag (XB)
(5) Disconnection detection signal (XC) (Q68TD-G-H02 only)
(a) This signal turns on when any input signal line including a thermocouple 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 scale". (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) Disconnection state monitor signal (XC) (Q68TD-G-H01 only)
(a) The thermocouple input circuit of the conversion-enabled channel turns ON the
disconnection state monitor signal (XC) when any input signal line including the
thermocouple is disconnected.
To identify the disconnected channel, check with the disconnection state monitor
flag (Un\G49).
In addition, conversion update for the conversion-enabled channels stops.
(b) For measured temperature values to be stored when the disconnection state
monitor signal (XC) turns ON, any of "Up scale", "Down scale", or "Given value"
can be selected (refer to Section 3.2.3).
(c) Removing the cause of disconnection and turning ON the error clear request (YF)
turns OFF the disconnection state monitor signal (XC).
(d) When the line connection is recovered, the temperature conversion value update
is restarted regardless of the disconnection state monitor signal (XC) reset.
Offset/gain setting mode
offset/gain specification
(Un\G26, Un\G27)
Channel change completion
flag (XB)
Channel change request (YB)
Executed in Q68TD-G-H02(H01)
Executed in sequence program