The Discrete I/O Interval parameter defines the rate in milliseconds at which the 2500-RBC updates
I/O modules. This parameter specifies the minimum time between updates of the discrete I/O
modules. Valid values are 1-255 and the default value is 1.
The Word I/O Update Factor controls how often the word I/O modules are updated. The Word I/O
Factor is the number of discrete I/O updates performed per word update; for example, if the factor is
2, the word I/O modules are updated on every second discrete I/O update. Valid values are 1-255 and
the default value is 2.
The 50X Ignore Mismatch Mode parameter allows you to select the way I/O configuration
mismatches are handled. With the default setting, "Disable," the 2500-RBC handles I/O configuration
mismatches according to DP Standard mode, meaning that the configuration sent by the CPU to the
RBC must match the actual base configuration exactly, or else no I/O updates are performed. If you
enable 50X Ignore Mismatch Mode, the RBC performs updates with all modules whose configuration
matches, omitting only those modules whose configuration does not match. This mode of operation
does not conform to the DP Standard. For detailed information about how mismatches are indicated
and handled, see Section 2.8.
Configuring the Remote Base in WorkShop or Com Profibus
The remote base must be configured in WorkShop or Com Profibus to describe to the Profibus Master
which I/O modules are installed. In Com Profibus, this configuration is done using the "Properties" /
"Configure" / "Module" dialog. For each slot in the base, simply select the installed CTI or
Siemens® I/O module from the list. For more information or if you're using WorkShop, see Chapter
4.
Exporting a Binary Configuration File from Com Profibus
Once the RBC has been parameterized and configured in Com Profibus, a binary file is exported
which contains the configuration information. This file is used for setup of the Profibus Master. For
more information, see Chapter 3. This export step is not required when using WorkShop.
Merging the Configuration File into the Profibus Master
The exported binary file must be merged with the Profibus Master to bring in the I/O configuration of
the remote base. For more information about Merging the configuration file in Workshop (when
using the 2500-RBC with CTI 2500 Series® or Simatic® 505 PLC's), see Chapter 3. This merge
step is not required when using WorkShop.
2.5. Physical Installation
To insert the module into the I/O base, hold the top and bottom of the bezel and slide the module
carefully into the slot, pushing it all the way into the base. If you have inserted the module correctly,
you will feel a slight increase in resistance as the module mates with the base backplane connector.
Once the module is fully seated in the slot, tighten the captive screws at the top and bottom to hold
the module in place. To remove the module from the I/O base, loosen the captive screws, then move
the module. Take care not to damage the connector at the back of the module when inserting or
removing the module.
10
CTI 2500-RBC Installation and Operation Guide V1.6
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