Siemens SIMOCODE pro C System Manual page 386

Glossary
Modbus address table
Data with similar properties are combined in one of four address tables: Discrete inputs,
coils, input register, holding register
Modbus RTU
Modbus RTU (Remote Terminal Unit) is a standard protocol for network communication and
uses the electrical RS485 connection for serial data transmission between Modbus devices
in the network.
Modbus RTU uses a master/slave network in which the entire communication is triggered by
only one master device while the slaves can only respond to the request of the master. The
master sends a request to a slave address and only this slave address responds to the
command (exception: broadcast frames to slave address 0 which are not acknowledged by
the slaves).
Monitoring functions
The following monitoring functions
● Ground-fault monitoring
● Current limit monitoring
● Voltage monitoring
● Cos phi monitoring
● Active power monitoring
● 0/4 to 20 mA monitoring
● Operation monitoring
● Temperature monitoring (analog)
Operate "in the background" in the same way as motor protection and motor control. They
can be active or not, according to the control function selected.
Monitoring the number of starts
Monitoring the number of starts can protect system parts (motors and switching devices such
as soft starters and converters) from too many start processes within a parameterizable time
frame and thus prevent damage. This is particularly useful for commissioning or manual
control.
Motor protection
The basic unit has several protection mechanisms for current-dependent motor protection:
● Overload protection
● Unbalance protection
● Stalled rotor protection
● Thermistor protection.
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System Manual, 05/2019, A5E40507475002A/RS-AD/004
SIMOCODE pro