100000550中文資料圖爾克數(shù)據(jù)手冊(cè)PDF規(guī)格書

The RS485 segment coupler SC11Ex-3G from

TURCK has been developed for intrinsically

safe PROFIBUS-DP and Modbus RTU connection.

Equipped with one RS485 and one RS485-

IS interface, this coupler is suited for many Ex

area applications. The RS485-IS interface has

been created completely in accordance with

the PNO PROFIBUS guideline.

When PROFIBUS telegrams are transmitted, the signal amplitude, edge steepness and

bit width of the data telegram are regenerated in the coupler. Received PROFIBUS telegrams are checked for plausibility by means

of start-delimiter sequences. Faulty Profibus

telegrams are filtered out and not forwarded

to the next segment. Only the bit width (byte

refresh) and signal amplitude are processed

for Modbus RTU and byte-oriented serial data

flows.

Different redundancy concepts (line, system

or slave redundancy) can be implemented by

connecting multiple segment couplers.

Segment coupler SC11… is IP20-rated and

can be mounted in zone 2/22.

In switch position 0, the coupler identifies

the baud rate automatically. Detection of

the transmission rate is started after a reset, change in baud rate or reset of the rotary

switch. For Modbus RTU and byte-oriented

serial data flows, the fixed transmission rate is

set via the rotary switch positions from 3 to

9.

Equipotential bonding is implemented with

a threaded bolt that is only connected to the

housing. The shielding of the Fieldbus cable

is implemented via a separate connection with

the option of choosing between capacitive or

direct grounding. The housing potential is not

connected with the shielding potential.

■ Device for intrinsically safe separation of

RS485 and RS485-IS

■ PROFIBUS-DP and Modbus RTU

■ For connecting more than 32 PROFIBUSDP slaves in a PROFIBUS network

■ Supports redundancy

■ Automatic baud rate detection