D6500 Modbus Analog Output Module

The D6500 analog output modules contain two outputs for controlling annunciators, valves and more. Each analog output can be programmed as either a voltage or current output by selecting one of four ranges: 0-10Vdc, +/-10Vdc, 0-20mA and +/-20mA.

The analog outputs contain a 12-bit digital to analog converter for generating the output signals. The output signals are updated as a supervisory computer transmits digital data values to the module. The data values are scaled in 16-bit unsigned integer data format that represents a percentage of full scale. See the Modbus scaling example link below.

The D6500 analog output module contains a user-programmable communications watchdog timer. The communications watchdog timer can be used to force the analog outputs to a known “safe” condition in the event of a communications lost to the module. The known “safe” condition can be user-programmed into the module Initial Value register.

All digital data values are transmitted using the Modbus RTU serial protocol via an RS-485 serial connection. The D6000 series supports up to 247 devices on one serial port.

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Modbus Scaling Overview

The D6500 Modbus analog output modules can be mounted on a DIN-rail using the MK-1 mounting kit.