Instructions

112Hardware

exceed 2m, since this will cause communication errors. However, when longer lines are needed, it is

helpful to put an I2C power driver (Order No. 198280) in-between.

The RELBUS-Board is supplied by the screw clamp "VREL" with power. The UNIT-BUS is used in

this module only as a communication interface, and for the supply of the digital electronic part of the

circuit. The relays are powered externally via "VREL"!

REL4-Board overview

Addressing:

The I2C address jumpers J1 to J3 are located on the front of the REL4-Board. When using several

modules and depending on the desired address the jumper must be set as follows:

Address

Hex 27

Hex 26

Hex 25

Hex 24

Hex 23