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1
General information
1.1
Brief description of the device
The Sigma MOD AO module with analogue outputs 4..20 mA is a non-portable device designed for
continuous operation and installation on the DIN35 rail inside control cabinets, cubicles or other suitable
enclosures that are wall-mounted inside facilities to be protected.
Gas detectors continuously measure momentary concentrations of hazardous gases and digital information
about concentration values is supplied to the module with analogue outputs 4..20 mA that converts input
information into corresponding levels of output currents.
1.2
Purpose
The Sigma MOD AO module is designed for collaboration with gas detectors and auxiliary devices to make
up the digital system for gas detection – Sigma Gas. Gas detection systems are frequently integrated with
other devices or systems for automatic control already deployed in existing industrial and other facilities
and designed to use signal transmission by means of 4..20 mA current loops. If so, a need appears to
provide an interface between the Sigma Gas system, which is based on digital transmission of information,
and an existing system for automatic control with the 4..20 mA current loop. Only such an interface enables
seamless coupling of the two systems and it is the reason why the Sigma MOD AO module is indispensable
for these applications.
Key tasks of the Sigma MOD AO module include:
readouts of digital information from gas detectors (RS-485 serial transmission with the Sigma BUS
protocol),
control of output current for eight analogue outputs 4..20 mA,
indication of the module status (Operation /Failure).
Parameters for operation in gas detection systems:
handling up to 8 gas detectors,
control of 8 analog outputs 4..20 mA.
Input circuits of the Sigma MOD AO module (RS-485, USB, power supply) are electrically separated from
output circuits 4..20 mA.
Figure 1: Structure of the Sigma MOD AO module – separation between input and output circuits
s. 5|12
User Manual: POD-004-ENG R01
POWER SUPPLY
SBUS
OUTPUT 8
OUTPUT 7
OUTPUT 6
OUTPUT 5
OUTPUT 4
OUTPUT 3
OUTPUT 2
OUTPUT 1
GND
+
GND
B
A
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
Sigma
MOD AO
4...20 mA
4...20 mA
4...20 mA
4...20 mA
4...20 mA
4...20 mA
4...20 mA
4...20 mA
-
+
S
4...20 mA
RS 485
Powe supply
Summary of Contents for PW-036-A
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