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Installation
2.6
Inputs
VISY-Input 8 has eight input terminals for recording alarms (see below) signalled by external
devices. Each individual input can either act as a digital voltage input or as an input for a re-
lay contact. To connect the input signal one 3-pin screw terminal is used for each input. The
screw terminals are assigned from left to right to the inputs of the top row 2, 4, 6, 8, and the
bottom row 1, 3, 5, 7. The position of the screw terminals is shown in Figure 1.
Figure 3: Input screw terminals
2.6.1
Input for external voltage
If an input shall act as a digital voltage input, the jumper of this input must be removed from
the 2-pin plug connector. The external voltage has to be connected to the terminals "In" and
"GND". This input is then galvanically isolated from the other inputs (removed jumper as-
sumed). Within the permitted voltage range (0 ... 24 V DC) the inputs are protected against
damages caused by reverse polarity.
Switching thresholds:
If U
In
≤
1.5 V DC, the input is deactivated, if U
In
≥
2.5 V DC, the input is activated.
2.6.2
Input for external relay contact
If an input shall act as input for an external relay contact, the jumper of this input must be
plugged onto the 2-pin plug connector (factory setting). The external relay contact has to be
connected to the terminals "In" and "+12 V" of the input.
For the supply of external relay contacts VISY-Input 8 has an internal 12 V voltage supply.
The inputs are galvanically connected by the internal 12 V voltage supply. The maximum cur-
rent via the relay contact is limited to 10 mA ±10 %.
2.7
Connection to VISY-Command
Up to eight modules VISY-Input 8 can be operated simultaneously with the VISY-X tank
gauging.
For the connection of VISY-Input 8 a communication adapter VISY-ICI 485 is required which
must be installed inside VISY-Command. The communication between VISY-ICI 485 and
VISY-Input 8 is performed via a galvanically isolated RS485 interface. The communication line
is to be connected to the terminals A, B and GND of the 3-pin screw terminal.
GND
In +12V GND
In +12V GND In +12V GND
In +12V
Input 2
Input 4
Input 6
Input 8
Input 1
Input 3
Input 5
Input 7
Содержание VISY-Input 8
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