Basic properties

All modules are powered by 10…35 V DC, 14…24 V AC. Typical power supply is 24 V AC. The power terminals are marked 1 and 2, or G and G0. Polarity with DC voltage does not matter (part of the power supply circuits is a Graetz rectifier). Module consumption is about 1 VA depending on module type and status of the relays.

The bus communication is connected to terminals K1+ and K1-. The RS485 is a 2-wire bus, polarity must be kept. Communication speed is selectable in the range of 1200 to 115200 bps, the higher value may be lower at older module types. Default is 9600, which is also the recommended speed for normal usage.

To connect all the signals and power, removable screw terminals are used. This makes installation and service easy. The modules are snapped on a DIN rail. Most of the modules have uniform width of 71 mm, see data sheets for detailed dimension description.

At the front side of the module is a label with module name and indication LEDs. All modules have two LEDs indicating power and bus communication (transmitting), another LEDs are on modules with binary inputs and outputs to indicate states of the datapoints.

Close to the communication terminals there are switches for bus termination and initialisation. The usage is described in the section Commissioning of the I/O modules
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