Our popular Panel-Mount 1781-5B08 and DIN-Rail Mount 1782-5B08 boards can multiplex up to 8 of the WRC 1781-5B or compatible analog modules in any mixture. It has two analog buses: one for analog input and one for analog output. This two-bus configuration takes advantage of the switch controlled outputs on the 1781-5B input modules and the sample and hold inputs on the 1781-5B analog output modules. A temperature sensor is mounted on each channel to provide cold junction compensation for thermocouple modules. Field connections are terminated with four screw terminals at each module location. Up to four 1781-5B08 mounting boards may be daisy chained with a single WRC 1781-JxA adapter to support a maximum of 32 analog I/O modules per adapter. For the 1781-5B08, 3/4″ standoffs are provided for panel mounting. The 1781-5B08 Mounting Board is fuse protected through F1. Zener diode DZ1 provides extra protection by clamping the input power voltage to 5.6 V. If the input supply voltage connection is reversed, this zener diode will be forward biased and fuse F1 will be blown.
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