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specific inputs (see Section 5.5), these inputs can be considered as two logic levels. Current status of these
inputs can be viewed on the user interface (see Section 3.1.2).
These inputs are galvanic separated from other circuits of the device, although no galvanic separation
between individual inputs is provided (see Figure 14). An input is activated when voltage of any polarity is
delivered across the terminal 1 to 4 appropriate for a specific input and COM terminal. It is illustrated on the
drawing below:
The DI1 to DI4 offer a broad range of configuration options for operation of the control unit. For instance,
they can be used to:
mute (deactivate) the internal buzzer for a predefined time (see Section 3.5),
switch off (deactivate) any relay output (in particular, mute an external sound warning device),
unlock any outputs already locked by a tripped detector (in particular, reset an optic/light warning
device driven by a locked alarm),
enforce deactivation of any relay output.
Any input can operate as a non-inverted one (delivery of voltage activates the input) or an inverted one (the
input in inactive when voltage is supplied to the input).
By default, inputs are assigned to the following operations:
Input number
Operation
Non-inverted /inverted
DI 1
Deactivation of an internal buzzer
non-inverted
DI 2
Deactivation of an external sound warning device
(siren)
non-inverted
DI 3
Reset of a locked optic /light warning device
non-inverted
DI 4
Activation of an alarm
non-inverted
Table 4: Default assignment of digital inputs (DI)
The desired configuration of inputs DI 1 to DI 4 must be specified upon submission of the
order (the outputs are configured by the manufacturer at the factory workshop).
2.3
SBUS communication port
The communication port is meant to exchange information between individual devices within the Sigma
Gas system. It is a serial port for digital transmission based on RS-485 link and Sigma Bus protocol.
The port is sensitive to polarity of transmission lines – see details in Section 2.5.
s. 13|40
User Manual: POD-003-ENG R04
Figure 8: Delivery of input signals to logic inputs DI 1 and DI 2
1
2
3
4
COM
U
1
U
2
Summary of Contents for PW-033-B
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