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TECHNICAL DESCRIPTION
The eight-channel I/O interface module is a device with microprocessor controlled electronic circuitry.
By default, 8 inputs correspond to 8 outputs. Another additional input is designed to control the user-selected outputs
(centralized switching function).
The RS-485 interface ensures the configuration of the device, output control and reading input/output status on a ModBus
RTU. The user can set parameters using any software that supports the ModBus RTU protocol; it is only required for the
initial configuration of the device and is not needed during further operation (however, connection to RS-485 maintains
additional direct control during operation of the device). Parameter settings are stored in non-volatile memory.
The overall dimensions and appearance of the device are shown in Fig. 1. The device is mounted onto a standard 35 mm
wide DIN-rail. The width of the module is 3 standard DIN units.
The status of each output, the availability of input power, and data exchange are displayed by LEDs on the front panel.
1 – Power indicator;
2 – Data exchange indicator;
3 – Output status indicators;
4 – Transmission line termination switch: ON – last device in the line; OFF – there are other devices in the line (see
documentation on the RS-485 network topology for details);
5 – Factory reset button.
Fig. 1
4
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