Profibus PROFI-2510, Быстрый старт Руководство пользователя

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supplied to module, PWR LED will turn on; Transmitting/receiving one data
to/from fiber cable will flash the DP1/DP2/TxD/RxD LED once. The
DP1/DP2/TxD/RxD LED may always be turned on if there are a lot of datas
transmitted on fiber cable.
PROFI-2510 PROFI-2541(SC)
PWR Led (Red) PWR Led (Red)
ON Module active ON Module active
OFF Module inactive OFF Module inactive
DP1 Led (Green) TxD Led (Green)
Flashing Data transmitting Flashing Data transmitting
OFF No data transmitting OFF No data transmitting
DP2 Led (Green) RxD Led (Green)
Flashing Data transmitting Flashing Data transmitting
OFF No data transmitting OFF No data transmitting

Terminating Resistors
In order to minimize the reflection effect of the signal transmission,
PROFIBUS device has to fit with an active terminal resistor at both first
node and last node. The connection of active terminating resistors is shown
in above circuit diagram. The PROFI-2510 / PROFI-2541(SC) doesn’t have
any terminating resistors inside. Therefore, users must add the terminator
in external. In general, PROFIBUS connector has terminating resistors
inside, and there is a switch to control the ON/OFF of the terminating
resistors, as shown below.