1
1
C
C
H
H
A
A
N
N
N
N
E
E
L
L
T
T
E
E
M
M
P
P
E
E
R
R
A
A
T
T
U
U
R
R
E
E
T
T
R
R
A
A
N
N
S
S
M
M
I
I
T
T
T
T
E
E
R
R
1
1
7
7
O
O
F
F
2
2
5
5
1
1
2
2
0
0
-
-
3
3
5
5
9
9
-
-
1
1
2
2
T
T
Y
Y
P
P
E
E
S
S
I
I
L
L
B
B
U
U
S
S
-
-
T
T
X
X
1
1
T
T
U
U
S
S
E
E
R
R
M
M
A
A
N
N
U
U
A
A
L
L
I
I
s
s
s
s
u
u
e
e
:
:
0
0
5
5
TX1T::>DELPT SET 1
Setting Changed
1: J3 Trips on a falling edge at 65.1degC
TX1T::>_
The above example shows the deletion of the first set point
. The keyword “SET” is
required to in
voke the deletion. The number “1” specifies which set point to delete. Note
that remaining set points are renumbered after execution of the delete command. The
next example shows the use of the keyword “ALL” with the delete set point command.
TX1T::>DELPT SET ALL
All points deleted
TX1T::>_
6.11 TRIP SET POINT HYSTERESIS COMMAND
This command is used to display and configure the common set point hysteresis for the
temperature input. The hysteresis value is used to stop the set point alarms from
switching on and off with any noise that may be present on the temperature input signal.
For example if the temperature input was currently at 64.9
o
C and the set point level was
set at 65
o
C for a rising alarm, the input signal would only need slightly more than 0.01
o
C
of noise or jitter to cause the set point alarm to randomly switch on and off. By setting the
hysteresis value to slightly higher than any known noise this random and annoying
switching can be eliminated. The hysteresis value is common to all setpoints. The current
hysteresis value can be displayed by simply entering the command name as shown in the
example below:
TX1T::>TRPHYS
Hysteresis level 0.5degC
TX1T::>_
If the command name is entered with additional attributes the hysteresis level can be
configured to any valid level. An example of configuring the hysteresis level is shown
below:
TX1T::>TRPHYS SET 0.3
Setting Changed
Hysteresis level 0.3degC
TX1T::>_
The range of the hysteresis is from 0.1ºC to 10ºC.
6.12 TEMPERATURE INPUT COMMAND
The temperature input command is used to display the current value of the temperature
input. This command can only be used of SILBUS or 9V battery is connected to SILBUS
port. If power is not connect the following message will appear:
