I/O System S900
Communication Interface for PROFIBUS DP, CI920
26 3BDD010422R0101
Parameter Settings Description
Redundancy mode off In case of an error of the active CI920 or its PROFIBUS
line the control takes over to the passive CI920, if
plugged.
mode 1 Two communication interfaces for line and redundancy.
mode 2 Reserved
mode 3 Reserved
Power supply single No supervision (diagnostics) of redundant power
supplies.
redundant A power supply failure leads to a diagnostics.
Cyclic data* function 1 Reserved
function 2 Reserved
function 3 Reserved
special Reserved
HCIR WCBC base 0..6300ms in
steps of 100ms
Worst Case Bus Cycle. Timeout for monitoring the
online re – configuration (HCIR). If the PROFIBUS –
master supports HCIR, these parameters are set
automatically.
HCIR WCBC factor : 16 / : 1 The entered time constant WCBC base can be
multiplied by 16.
HCIR active on / off This bit has to be set by the master before the following
LeaveMaster – telegram starts the HCIR – sequence.
Address Offset value 0..124 Offset of the address of the redundant CI920.
Address Offset On / off Address Offset adjustment enable / disable
SF1 Reserved
SF2 Reserved
SF3 Reserved
*) only available / relevant for CI920 with own cyclic data (CIPB C and CIPB CD)
Behavior
Cold start
A parameter telegram sent by the master is submitted to a plausibility check
in the S900. The system can only start up properly when the parameter
telegram is free of errors. If there are any errors in the telegram, they are
communicated to the operator via the diagnostic function.
Re-parameterization in online-mode
This term refers to the uninterrupted download of an updated parameter data
set into a slave. While this procedure is in progress, the DataExchange state is
never left. The I/O System S900 permits uninterrupted downloading if the
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