Yokogawa Touch Screen GP20 - Manual (Page 32)

1-18
IM 04L51B01-01EN
Type
Set the alarm type.
Options Description
H: High limit An alarm is activated when the measured value is greater than or equal to the
alarm value.
L: Low limit An alarm is activated when the measured value is less than or equal to the
alarm value.
R: High limit on rate-
of-change
An alarm is activated if the increasing rate-of-change of measured values over
a certain interval is greater than or equal to the specified value.
r: Low limit on rate-of-
change
An alarm is activated if the decreasing rate-of-change of measured values over
a certain interval is greater than or equal to the specified value.
T: Delay high limit An alarm is activated if measured values remain greater than or equal to the
alarm value for a specified time period (delay period).
t: Delay low limit An alarm is activated if measured values remain less than or equal to the alarm
value for a specified time period (delay period).
h: Difference high limit An alarm is activated when the difference in the measured values of two
channels is greater than or equal to the specified value. This alarm can be
specified on measurement channels set to difference calculation.
l: Difference low limit An alarm is activated when the difference in the measured values of two
channels is less than or equal to the specified value. This alarm can be
specified on measurement channels set to difference calculation.
Alarms of channels set to difference calculation are set in the position shown in the figure
below.
Input value
Measured value on the reference channel
H, L, T, t R, r, h, l
Measured value
—
Value
Set the alarm value for the specified alarm type.
Options Value Examples of Alarm Value Range
H, L A value within the measurable range –2.0000 to 2.0000 V for 2 V range
–270.0 to 1370.0°C for thermocouple type K
R, r 1 digit to the upper limit of the width of the
measurable range
0.0001 to 4.0000 V for 2 V range
0.1 to 1640.0°C for thermocouple type K
T, t Same as H and L Same as H and L
When the Channel Calculation Is Set to Delta
Options Value Examples of Alarm Value Range
H, L A value within the measurable range –2.0000 to 2.0000 V for 2 V range
–270.0 to 1370.0°C for thermocouple type K
h, l A value within the measurable range –4.0000 to 4.0000 V for 2 V range
–1640.0 to 1640.0°C for thermocouple type K
R, r 1 digit to the upper limit of the width of the
measurable range
0.0001 to 4.0000 V for 2 V range
0.1 to 1640.0°C for thermocouple type K
T, t Same as H and L Same as H and L
When the Channel Calculation Is Set to Linear Scaling or Square Root
Options Value Examples of Alarm Value Range
H, L –5% to 105% of the scale width However,
within –999999 to 999999 excluding the
decimal point.
–5.0 to 105.0 when the scale is 0.0 to 100.0
–120.00 to 320.00 when the scale is –100.00
to 300.00
R, r 1 to the scale width but within 1 to 999999
excluding the decimal point.
0.1 to 100.0 when the scale is 0.0 to 100.0
0.01 to 400.00 when the scale is –100.00 to
300.0
T, t Same as H and L Same as H and L
1.2 Configuring AI Channels (Analog input (including DI) channels)