FMS EMGZ Series, Руководство по эксплуатации

Страница: 30 / 41

Operating Manual EMGZ611A...614A
30
11 PROFIBUS Interface Hardware Description
11.1 Wiring of the PROFIBUS Data Cable
Wiring of the PROFIBUS cables
The standardized PROFIBUS cable type A (STP 2x0.34
2 ) [AWG] has to be used for
the PROFIBUS data cable. The cables are bared referring to fig. 4 and connected
to the terminals according to the wiring diagramm.
The shield is connected with the bracket to the shoulder inside the housing.
Caution
The shield of the PROFIBUS cable is only grounded if the bracket inside the
housing clamps directly to the shield If the bracked clamps to the plastic mantle,
no grounding is done! Therefore the plastic mantle has to be fixed only with the PG
gland (referring to fig. 4)
Termination
If both cables are connected (Bus in and Bus out), if has to be ensured that the
two termination dip switches are in off position. If only one cable is connected (Bus
in), both termination dip switches have to be set in on position.
fig 14: Profibus board E621009 fig.15: Setting Profibus E621012e
Note
The PROFIBUS network has to be terminated properly. Otherwise the installation
cannot be set into operation. It has to be ensured that only the last device of the
PROFIBUS chain is terminated.
11.2 Setting the PROFIBUS Address
The measuring amplifier requires a unique PROFIBUS address which indicates it
definitely in the whole PROFIBUS network. Therefore no other PROFIBUS device in
the network may use the same address. The address has to be between 2...125.