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Installation, Operation and Maintenance Manual
VCIOM-01493-EN Rev. 0
Section 9: EPI2 DPV1 Interface Power-Up
The EPI2 DPV1 interface takes its electrical supply from the actuator power supply module.
The RS485 bus transceiver is isolated from the actuator electronics. Also, the voltage
supply of the bus termination is isolated. The bus termination is a crucial component
to ensure error-free operation; since the Profibus terminations are active circuits, it is
important that they remain powered also when a part of the field is powered off. Normal
practice recommends to use external terminations available on the market and to power
them by a separate, safe power supply. The EPI2 DPV1 interface is equipped with an
on-board bus termination that can be used when the actuator is at the beginning or at
the end of the bus segment. If the on-board termination is used, it is not possible to use
external termination, as well. The bus termination can be connected on the data lines by
means of a soldering pad.
Figure 37 shows the typical Profibus wiring. The termination must be linked to the data
lines only if the actuator is at the beginning or at the end of the bus segment.
Figure 37
On power-up, the module checks the baud rate and then waits for the "parameterization"
telegram from the master. The parameterization message contains user information
needed for actuator operation and is listed in Section 10, Data Exchange
During Parameterization.
After parameterization, the module waits for the "configuration" telegram from the
master. The configuration message contains the number of input and output bytes
reserved in the memory of the master device for each slave. Only the number of bytes
determined in the configuration is transmitted between master and slave. This information
is called "module".
The EPI2 DPV1 board implements the following modules:
•
•
•
•
EPI2 DVP1 Power-Up
EPI2 DPV1
interface
Data line +
Profibus
Soldering pad
RS485
transceiver
Data line -
DGND
Module 1: 1 byte output; 2 bytes input
Module 2: 4 byte output; 6 bytes input
Module 3: 1 byte output; 2 bytes input - consistent
Module 4: 4 byte output; 6 bytes input - consistent
Section 9: EPI2 DVP1 Power-Up
Terminal
VP
board
Rx/Tx-P-in
390 ohm
Rx/Tx-P-out
220 ohm
Rx/Tx-N-in
Rx/Tx-N-out
390 ohm
May 2022
Shield
Bus out
Bus in
23
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