CCR961 MANUAL-GB
40
Version B2:01-07-2015
6.2
Redundant Profibus
When a Profibus communication interface to the remote control system is required, the CCR
Module will have a Redundant Profibus Board added internally, and this will then communicate
with the CCR Main board in a RS485 protocol.
The connections in the CCR cubicle is a set of terminals (-XX1).
Description of PROFIBUS
The Profibus module can be used as a single or redundant interface to the Main Board via RS485.
The Module is constructed and based on two nos. Siemens ASIC circuit LSPM2, which fulfils the
Profibus format according to IEC 61158.
Redundant use:
Port PB.0
Master Bit
determinates which channel (A or B) is controlling the CCR.
The detection of the Master bit is edge triggered (edge sensitive).
The channel with the latest change from 0 to 1 is the controlling channel. This is also the case if
the Master bit is 1 from both channels.
If the Master bit in both channels is permanently set to 1, and there is a failure on one Chanel,
there is a risk that the communication will fail, as no shift is detected in the master bit.
Response time:
The data communication between Profibus board and main board is stroke controlled. The
Profibus module will send data to the main board with fixed intervals of 200mS and the main
board will send data to the Profibus module with fixed intervals of 300mS.
The total time from data received from the Profibus until a response is placed in the buffer on the
Profibus module, which can be read via the Profibus, will vary from app. 10mS to app. 510mS.
(200mS + 300mS + 2 x 5mS (µP program cycle).
The individual functions are described in the following table and examples.
PROTOCOL CONVERTER
LSPM2 (IM184)
PORT A
PORT C
PORT B
PORT D
PROFIBUS A
DATA FROM MASTER
DATA TO MASTER
µP
CCR 961
PORT E
RUN
MASTER
PROTOCOL CONVERTER
PORT A
PORT B
PORT D
PORT C
PROFIBUS B
PORT E
MASTER
DATA FROM MASTER
RUN
DATA TO MASTER
RS485
LSPM2 (IM184)
.
