Section 2
– Operation
TOELLNER Electronic Instrumente GmbH
11
This results in the following possible operating conditions:
Configuration of TOE 9261
and consumer
DIL switch
CONTROL / INV
CONTROL
signal
Consumer status
Switching of positive supply line
--
Low
Disconnected (OFF)
--
High
Supplied (ON)
INV
Low
Supplied (ON)
INV
High
Disconnected (OFF)
Switching of return line (ground)
--
Low
Supplied (ON)
--
High
Disconnected (OFF)
INV
Low
Disconnected (OFF)
INV
High
Supplied (ON)
The appropriate setting of the
CONTROL / INV
DIL switch can therefore be selected
depending on the desired configuration (switching of positive supply line or of return line) and
the desired function of the control signal (High level should lead to supply of consumer or to
disconnection from the supply).
In the disconnected status of the consumer, a buffer stage present in the consumer and
possibly still charged is discharged if one of the two following cases exists:
TOE 9261
and consumer were connected in the configuration for switching the positive
supply line, and one of the two DIL switches
S2 + 0.1
Ω
and
S2 + 0
Ω
is set to
ON
(
2.4.9 Use of the branch path).
TOE 9261
and consumer were connected in the configuration for switching the return line
(ground), and the DIL switch
S1 ENABLE
was not set to
OFF
.
Note
If the
CONTROL
input is not connected or controlled but left in a high-impedance state,
this is evaluated as Low level. If in this case either the DIL switch
CONTROL / INV
is set to
INV
or the DIL switch
PULL-UP / ON
to
ON
, the internally evaluated level changes to High,
resulting in switching path
S1
becoming conductive and switching path
S2
non-conductive.
In the configuration for switching the positive supply line, the consumer is then
permanently connected to the supplying voltage source.
In the configuration for switching the return line (ground), on the other hand, the consumer
is permanently connected to the supplying voltage source if
– with the
CONTROL
input left
in a high-impedance state
– the named DIL switches are either both in the left-hand or
both in the right-hand positions.
2.4.8
Display of the switching states
A conductive path
S1
or
S2
is indicated by the red LED at the related switch symbol. To
ensure always the perceptibility of the display, in case of high frequencies or short High or
Low pulses of the switching signal at the
CONTROL
input, not the actual fast changing
switching states are displayed, but it is calculated a slowed down signal for the display LEDs.
The switching paths themselves, however, are controlled by the timing of the switching
signal.
2.4.9
Use of the branch path
In the configuration for switching the positive supply line,
S2
represents the load parallel
branch path. The switching state of the branch path
S2
is always complementary to the state
of the longitudinal path
S1
. This means the consumer can be jumpered with
S2
, while
S1
is
open (not conducting). This allows for example a buffer stage in the consumer to be
discharged.
To achieve the fastest possible discharging without a series resistor, DIL switch
S2 + 0
Ω
must be set to
ON
. For indication the green LED next to the related switch symbol is
illuminated.
