Yokogawa PC-Based MX100 - Manual (Page 44)

44
IM MX100-0E
Alarm Hysteresis
You can set a width (hysteresis) to the values used to activate and release alarms.
Alarm hysteresis prevents frequent activation and release of alarms when the measured/
computed value is unstable around the alarm value.
Alarm
setting
Alarm release
Measured value
Alarm activated
Upper limit alarm Lower limit alarm
Measured value
Alarm release
Hysteresis
Alarm setting
Alarm activated
Digital Output
Click Channel on the Monitor bar to display the Channel setup screen. Set the output of
the digital output module in the DO Channel tab.
Output channel number
First alarm reference channel number
Last alarm reference channel number
Select output or not output
Select the output action Turn ON/OFF
alarms 1 to 4
Select manual
DO buttons
Select energize/de-energize
of output relay
Select hold/non-hold
of output relay
Click DO Channel tab
Selecting the Action for the Digital Output
The digital output can be enabled for the following causes.
• Alarm output
Outputs a signal when an alarm occurs according to the alarm settings.
• Manual DO
When the manual DO button on the Monitor screen is clicked, all the DO channels
assigned to the button number output relay contact signals collectively.
Manual DO button
Click to switch ON/OFF
• FAIL output
Outputs a relay contact signal when a error occurs in the main module CPU.
• Error output
Outputs a relay contact signal when any of the following events occur.
• A data output request timeout (60 s) occurs while recording data.
• A module error occurs.
Operations of the MX100 Standard Software