4
4
C
C
H
H
A
A
N
N
N
N
E
E
L
L
A
A
N
N
A
A
L
L
O
O
G
G
U
U
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
9
9
O
O
F
F
3
3
0
0
1
1
2
2
0
0
-
-
1
1
8
8
8
8
-
-
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
4
4
A
A
(
(
G
G
)
)
U
U
S
S
E
E
R
R
'
'
S
S
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
TX4A::>_
The use of the set point delete command without any attributes does not delete any set
points.
TX4A::>DELPT SET 1 3
Analog Input 1
1: G1 Trips on rising edge at 14.0mA
2: G2 Trips on rising edge at 15.1mA
3: G8 Trips on rising edge at 17.3mA
4: !G3 Trips on rising edge at 18.0mA
Analog Input 2
1: H2 Trips on rising edge at 6.3mA
Analog Input 3
No Set Points
Analog Input 4
1: J1 Trips on falling edge at 16.5mA
2: J2 Trips on falling edge at 16.0mA
TX4A::>_
The above example shows the deletion of the third set point on analogue input 1. The
keyword “SET” is required to invoke the deletion. The number “1” specifies the analogue
input and the “3” specifies which set point to delete. Note that set points four and five are
renumbered after execution of the delete command. The next example shows the use of
the keyword “ALL” with the delete set point command.
TX4A::>DELPT SET 1 ALL
Analog Input 1
No Set Points
Analog Input 2
1: H2 Trips on rising edge at 6.3mA
Analog Input 3
No Set Points
Analog Input 4
1: J1 Trips on falling edge at 16.5mA
2: J2 Trips on falling edge at 16.0mA
TX4A::>_
6.14 HYSTERESIS COMMAND
This command is used to display and configure the fault and set point hysteresis value for
all of the analogue inputs. The hysteresis value is used to stop the fault signal from
switching on and off with any noise that may be present on the analogue input signal. For
example if the analogue input was currently at 4.00mA and the fault level was set at
3.99mA, the input signal would only need slightly more than 0.01mA of noise to cause the
fault signal 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
