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delivered across the terminal 1 to 4 appropriate for a specific input and COM terminal. It is illustrated on the
drawing below:
Figure 8: Delivery of input signals to logic inputs DI 1 and DI 2
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 3.4),
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 5: 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).
2.4
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 2.6.
2.5
ExBUS communication port – data gateway, External Data Inputs
The Control Unit Modules Sigma MOD LED and Sigma MOD DO comprise a communication port called
ExBUS designed for exchange of information between the Sigma Gas system and external environment (e.g.
PLCs, SCADA, etc.). The port is bidirectional and can be used both to read information about current status
of the Sigma Gas system. e.g. statuses of detectors, and to affect operation of the system by means of
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User Manual: POD-002-ENG R03
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Summary of Contents for PW-033-A
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