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6
Parameters Set by Software
Setting User
Parameters for the
PROFIBUS-DP RBC
Parameter
Valid Values
Discrete I/O
1–255 msec
Interval
Word I/O
1–255
Update Factor
50X Ignore
Mismatch
Disable/Enable Disable
Mode
50X RS-232
Disable/Enable Disable
Comm Port
Discrete I/O
Interval
Word I/O Update
Factor
50X Ignore
Mismatch Mode
50X RS-232 Comm
Port
20
The PROFIBUS-DP RBC has parameters that are specified using the
COM PROFIBUS configuration utility software. Refer to the SIMATIC 505
TISOFT2 User Manual and the SIMATIC S5 ET 200 Distributed I/O
System Manual for information about using COM PROFIBUS.
Table 5 describes the parameters used to set up the 505/500 PROFIBUS-DP
RBC in COM PROFIBUS. You set these parameters by selecting the
"Parameterize" dialog box in COM PROFIBUS.
Table 5 PROFIBUS-DP RBC Software Parameters
Default Value
1
The RBC updates discrete I/O modules at this rate.
Determines the number of discrete I/O updates performed
2
per I/O word update.
Disable: specifies DP Standard configuration mismatch
handling.
Enable: specifies Series 50X configuration mismatch
handling.
Disable or enable RS-232 port communications.
The Discrete I/O Interval parameter defines the rate at which the
PROFIBUS-DP RBC updates I/O modules. This parameter specifies the
minimum time between updates of the discrete I/O modules.
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.
The 50X Ignore Mismatch Mode parameter allows you to select the way I/O
configuration mismatches are handled. With the default setting, "Disable,"
the PROFIBUS-DP 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.
The default for RS-232 port communications is communications disabled.
When 50X RS-232 Comm Port is enabled, the RBC is not operating in 100%
compliance with the PROFIBUS-DP Standard due to the additional network
traffic caused by task code transfers.
Comment
SIMATIC 505/500 PROFIBUS-DP RBC User Manual
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