I/O System S900
Communication Interface for PROFIBUS DP, CI920
system must ensure that the inputs are maintained for a short time. HCIR-
compatible OCRs support this function.
Refer to the PROFIBUS master user manual for details about using the HCIR.
Reaction in case of erroneous configuration telegrams
Modules not involved in the configuration changes continue operation, even
if the S900 System partly cannot understand the configuration telegram.
Implausible configuration and parameter telegrams may occur if there is a
mismatch between the GDS (device data) file and the CIPB software version
to be used.
Parameterization
Definition
On PROFIBUS DP the parameterization defines the behavior of a configured
I/O module (line monitoring, range…)
Changes of parameterization does not affect the structure of I/O data, so a re –
compilation of the project is not required any time. S900 accepts a parameter
telegram without interrupting the cyclic data exchange. Modern DCS like
ABBs AC800F are able to send parameter data interrupt free.
The following parameters have to be set for the communication interface:
Table 4-3 Communication Interface parameters
Parameter Settings
Description
Parameterization
mode
mode 1
Module-wise parameterization
mode 2
Channel-wise parameterization
Grid frequency
50Hz / 60Hz
Mains frequency in the direct environment. See also
description of analog input modules.
Analog data format
status MSB
Channel status is mapped on MSB of an Unsigned16 or
Unsigned32 value.
status LSB
Channel status is mapped on LSB (Bit 0) of an
Unsigned16 or Unsigned32 value.
no status
Channel status is not transferred
Rack size
4/8/16 modules
Set size of used termination unit. Communication
interface only communicates with specified number of
modules, beginning with slot 1 (left most).
3BDD010422R0101
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