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Amplifier- Servomotor
Amplifiers
Analogue I/O Modules
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Analogue Multiplexer
The RTM-8 is a 16-channel analogue multiplexer divided into eight 3-wire, Pt- 100 sensors and eight 4-20 MA process current inputs. It creates savings of Pt-100 transmitters, wiring cables and PLC's analogue inputs. It also enhances small PLCs limited by their analogue inputs capacity, by using a single analogue input to acquire as many analogue inputs as required. The RTM-8's output is 4-20 mA which is simply connected to a single PLC's analogue input. The input selection function is performed via four binary control lines (address) initialized by the PLC program, assuring full data synchronization between the controller and the multiplexer. The RTM-8 is provided with an Enable control line. When disabled, the unit's output is in a Hi-Z state allowing several units to be connected in a parallel to a single controller input by tying their outputs together, applying the same address lines, but providing a separate Enable control line to each multiplexer. The PLC's program must keep all but the selected multiplexer in a disabled state. The multiplexer is an all solid state unit, multiplexing the input channels with a switching time of less than 20 microseconds. Each of the Pt-100 inputs is a complete signal conditioner. They include a DIP switch array for coarse channel ranging as well as zero and span fine tuning multi-turn potentiometers on the front panel. Superb lead length compensation circuitry is provided for long distance connection of Pt-100 probes. The RTM-8 is housed in a polycarbonate enclosure which can be mounted on a 35 mm standard DIN rail.
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