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GRASSO SYSTEM CONTROL
01.2003/0 638660E_chapter5.doc Kap.5 - 9
The KL2134 digital output terminal connects the binary control signals from the automation unit on to the
actuators at the process level with electrical isolation. The terminal is protected against reverse polarity
connection. The terminal contains four channels that indicate their signal state by means of light emitting
diodes.
Figure 5.9: Digital output terminal with 4 channels
5.4.4 Analogue input terminals
The GSC is equipped with several types of analogue input terminals. The standard input signals use 4...20mA
signals. The temperature sensors, however, use PT100 signals directly.
The KL3054 terminal is used for the 4...20mA signals. The job of the KL3054 analog input terminal with sensor
supply is to supply power to measuring transducers located in the field, and to transmit analog measurement
signals with electrical isolation to the automation device. The voltage for the sensors is supplied to the terminals
via the power contacts. The input electronics is independent of the supply voltage of the power contacts. The “0
V rail” is the reference potential for the inputs. The RUN LEDs give an indication of the data exchange with the
Bus Coupler. The error LEDs indicate an overload condition and a broken wire. The KL3054 version combins 4
channels in one housing.
Figure 5.10: Analogue input terminals with 4 channels (4...20mA)
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