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Some interfaces are galvanic separated from each other. The idea is shown on the structural diagram below.
Figure 3: Galvanic separation between various interfaces of the control unit – structural diagram
4.1.1
Digital Input EXTERNAL ALARM
This input is designed to activate the status of EXTERNAL ALARM by using an external signal coming from
the automation system, alarm system or from a push button.
To use it connect voltage with any polarity to terminals (parameters – see section 17).
4.1.2
GTW data transmission port
The Control Unit Module Teta MOD Control 1 is equipped with the GTW data transmission port that is
designed for data exchange between the Teta Gas system and the external world (e.g. a superior PLC,
SCADA system, etc.). It is a bidirectional port and also enables readouts of the following information about
current status of the Teta Gas system.
statuses of gas detectors,
measured values of gas concentration,
statuses of relay outputs.
Data are exchanged via a digital line for serial transmission RS-485, where the control module acts as a slave
device. The foregoing functionalities are implemented by readouts of registers located in the area of
‘holding registers’ of the device. The following parameters of the transmission line are available:
variants of the data transmission protocols MODBUS ASCII and MODBUS RTU,
network address of the device ranging from 1 to 255,
transmission rates: 4800, 9600, 19200, 38400, 57600 or 115200 bds,
parity control: none (N), even (E) or odd (O),
frame format for the MODBUS ASCII protocol: 7 or 8 data bits.
All foregoing parameters can be customized by the system operator from the level of the device user
interface (see section 5.8).
See section 7 for the map of the device memory.
The GTW port is not provided with galvanic separation from the power supply line (see
Figure 3), therefore it must be connected to the RS-485 line via a line separator when the
connection is made to a device supplied from a different power adapter (see also the Teta
Gas System Manual at
).
s. 9|31
User's Manual: POD-051-ENG R02
Teta MOD Control 1
EXTERNAL
ALARM
R1
R2
R3
R4
R5
R6
3
3
3
3
3
3
2
2
3
POWER GTW, TETA BUS
SUPPLY
2
