76 SM-Applications Modules & Motion Processors User Guide
Issue Number: 4
6.3 Second Processor Mapping Parameters (fieldbus)
The Second Processor has internal parameters that can be written to or read from by
fieldbus options also fitted to the drive. This can provide a convenient way to
communicate between 2 fieldbuses. These parameters are shown in the table below.
The fieldbus interface module reads and writes data directly to and from the internal
registers in an Second Processor. The fieldbus interface module can read data from and
write data to an Second Processor fitted in any slot in the drive, simply by specifying the
target parameter as shown in Table 6-13.
6.3.1 Example configuration 1
Consider a drive with the following configuration:
• Slot 1 - Vacant
• Slot 2 - Second Processor
• Slot 3 - SM-PROFIBUS-DP module
If a parameter read request comes over the PROFIBUS-DP network to read Pr
71.08,
this will be re-directed to the Second Processor in the lowest slot number, i.e. slot 2. The
value in _Q08% from slot 2 will be returned.
If a parameter read request comes over the PROFIBUS-DP network to read Pr
131.08,
this will be sent straight to the Second Processor in slot 2. The value in _Q08% from slot
2 will be returned.
If a parameter read request comes over the PROFIBUS-DP network to read Pr
101.08,
this will be sent straight to the Second Processor in slot 1. As there is no Second
Processor fitted in slot 1, an error message will be returned, indicating that the
parameter does not exist.
If, for example, an SM-DeviceNet module is fitted to slot 1, you could use the direct slot
parameter reference to read or write data, giving a simple communications gateway
between DeviceNet and Profibus-DP.
Table 6-13 Second Processor Internal Parameters
Second Processor Parameters
Parameter
Reference
DIrect to
Slot 1
DIrect to
Slot 2
DIrect to
Slot 3
(Digitax
Embedded)
_Pxx% PLC Registers Pr 70.XX Pr 100.XX Pr 130.XX Pr 160.XX
_Qxx% PLC Registers Pr 71.XX Pr 101.XX Pr 131.XX Pr 161.XX
_Rxx% PLC Registers Pr 72.XX Pr 102.XX Pr 132.XX Pr 162.XX
_Sxx% PLC Registers Pr 73.XX Pr 103.XX Pr 133.XX Pr 163.XX
_Txx% PLC Registers Pr 74.XX Pr 104.XX Pr 134.XX Pr 164.XX
_Uxx% PLC Registers Pr 75.XX Pr 105.XX Pr 135.XX Pr 165.XX
Local Configuration Parameters Pr 81.XX Pr 111.XX Pr 141.XX Pr 171.XX
Timer Function Parameters
(Apps, Apps Plus & ST Plus Only)
Pr 85.XX Pr 115.XX Pr 145.XX Pr 175.XX
DIgital I/O Parameters
(Apps, Apps Plus & ST Plus Only)
Pr 86.XX Pr 116.XX Pr 146.XX Pr 176.XX
Status Parameters Pr 88.XX Pr 118.XX Pr 148.XX Pr 178.XX
General Parameters Pr 90.XX Pr 120.XX Pr 150.XX
Pr 180.XX
Fast Access Parameters Pr 91.XX Pr 121.XX Pr 151.XX Pr 181.XX
If a single Second Processor is fitted to the drive, normal Second Processor parameter
references can be used without problem, as the fieldbus will automatically divert them to
the Second Processor.
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