Siemens MICROMASTER 420 Reference Manual page 70

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Simply plugs into the front of the inverter.
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No separate power supply necessary.
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Digital and analogue inputs can be read and digital and analogue outputs
controlled via the serial bus.
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5 mSec response time to process data.
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Output frequency (and therefore motor speed) can be controlled locally on
the drive or over the serial bus.
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Multi-mode operation possible, whereby control data can be input via the
terminal block (digital inputs) and setpoint over the serial bus.
Alternatively, the setpoint can be from a local source (analogue input) with
the drive control over the serial bus.
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All drive parameters are accessible over the serial link.
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The PROFIBUS module is a push fit into the front of the drive. The clip at
the bottom must be pulled down to release the module.
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PROFIBUS Module can only be inserted or removed from the drive when
the drive is powered off.
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If the PROFIBUS Module is connected to the SUB-D socket on the front
panel, then the internal RS 485 connections of the 6SE32 drive (terminals
23 and 24) must not be used.
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PROFIBUS module must not be connected to the drive with a cable.
The data structure for communication over PROFIBUS-DP can be either PPO type
1 or PPO type 3 as specified in VDI/VDE 3689. This means in practice that
process data (control words, setpoints in the transmitted telegram and status
words, actual values in the received telegram) are always sent. Parameter data
exchange may, however, be blocked if bus bandwidth or PLC memory space is at
a premium. The data structure, and thus the PPO type, is normally specified by
the bus master. If no PPO type is specified (e.g. if a combined PROFIBUS
DP/PROFIBUS FMS bus master is used), the default PPO type is type 1
(parameter data exchange enabled).
Process data from the serial link always has a higher priority than parameter data.
This means that a setpoint change or drive control change command will be
processed faster than a parameter change command.
Parameter write access over the serial link can be enabled or blocked as required.
Parameter read access is permanently enabled, allowing continuous read-out of
drive data, diagnostics, fault messages etc. A visualization system can thus be
realized with minimal effort.
Local control of the drive with the On, Off, Jog and Reverse buttons is possible at
all times in an identical fashion to when the module is not present.
The PROFIBUS cable is connected to the 9 way SUB-D socket on the front of the
PROFIBUS Module.
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MICROMASTER 420 Reference Manual
Issue A1