Modern factories need to monitor a range of parameters requiring a high number of signal conditioners. All factories need to be more efficient and save costs by conserving energy and space wherever possible.
Control cabinets located on a factory floor house many types of equipment typically mounted on a DIN rail inside the cabinet. Equipment can include PLCs, signal conditioners, power supplies as well as DIN rail interconnecting blocks; put simply—space is at a premium. The larger the signal conditioner the more space it takes up inside the control cabinet thereby generating increased costs in cabinet size. Larger cabinets also take up more space on the factory floor.
The need for signal conversion can come in a range of input/output (I/O) possibilities. Signal conditioners with fixed input/output ranges need a different module for each input/output combination.
Non-isolated signal conditioners will not effectively block ground loops or other spurious voltages from passing through the signal conditioner, possibly damaging sensitive downstream equipment such as the PLC or data acquisition system.
Signal conditioners with higher power requirements need larger power supplies mounted on the DIN rail inside the control cabinet, which can take up more space and generate excessive heat.
Older signal conditioners can be up to 25 mm (1-in.) or more in width and require air gaps in between modules for heat transfer for cooling. Consequently 50 units can take up 1.25 m (4.1-ft) or more of DIN rail space, which depending on the size of the control cabinet, can lead to 1 or 2 rows of signal conditioners.
The DRSL-U isolated universal input DIN rail signal conditioner offers galvanic isolation of process signals to SCADA systems or PLC equipment. It accepts thermocouple, RTD, linear resistance, potentiometer, voltage or current input and converts these signals to linear voltage orurrent output. The unit isolates between input, output and supply, provides surge suppression and protects control systems from transients and noise. The DRSL-U also offers electrical isolation and eliminates ground loops and can be used for measuring floating signals.
The DRSL-U is space efficient and has a slimline housing that is 6 mm (0.24-in.) wide. Up to 50 units can be mounted on a DIN rail in the control panel and occupy only 30 cm (11.8-in.) on the rail. The DRSL-U’s low power design makes the typical 24 Vdc power requirement for 50 units only 40 W. These signal conditioners can be stacked vertically or horizontally and do not require an air gap in between modules.
The conditioner is configured using the programming interface in conjunction with the configuration adapter. The DRSL-DISPLAY has a 4-line LCD display with scrolling help text in 7 languages (English, French, German, Italian, Spanish, Danish and Swedish), which guides users through all the configuration steps. The DRSL-U is designed with electronic hardware switches, consequently it is not necessary to open the device to set any internal DIP-switches.