Supplement operating manual for DREHMO i-Matic actuators with integrated
MODBUS fieldbus interface
Wenden, 21.03.12
Page 16 of 18
Prepared by: Ste
2.5.2 Actuator i-Matic for Ex-Zone acc. ATEX device category 2 G – DiM-X1X
2.5.2.1
Connection with copper cable
The connection of the modbus signal lines (A, B) from inputs and outputs have to be done on the appropriate
terminals in the termination compartment. If the actuator is not the last node on the bus, the necessary T-
piece may be made up by means of using the available double terminals (A1, B1, A2, B2) which are
electrically connected. A bridge between incoming and outgoing bus signals has to be made to achieve the
required T-piece.
The bus terminator always has to be provided near or downstream of the last bus device for correct bus
termination. If the last bus device is an i-Matic type DREHMO actuator, the terminator can be activated by
connecting terminals Tx+ with Bx and Tx- with Ax (see next picture), (x = number of channel).
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Connection of two Profibus systems to an i-Matic drive
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channel 1: leading to the next device
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channel 2: last device on the segment (terminator activated)
Devices for use in explosive areas have a spur length of approximately 40 cm for each channel.
