Operating Modes Of The Cp 440; Startup Characteristics Of The Cp 440 - Siemens SIMATIC CP 440 Manual

Startup Characteristics and Operating Mode Transitions of the CP 440
7.1

Operating Modes of the CP 440

The CP 440 has the operating modes STOP, parameterization and RUN.
STOP
When the CP 440 is in STOP, no protocol driver is active and all send and receive
jobs from the CPU are given a negative acknowledgment.
The CP 340 remains in STOP until the cause of the stop is removed (e.g. break,
invalid parameter).
Parameterization
For parameterization, the protocol driver is initialized.
Sending and receiving are not possible, and send and receive frames stored in the
CP 440 are lost when the driver is restarted. Communication between the CP and
the CPU is started afresh (active frames are aborted).
At the end of parameterization, the CP 440 is ready to send and receive.
RUN
The CP 440 processes the jobs of the CPU. The frames received from the
communication partner are made available to be picked up by the CPU.
7.2

Startup Characteristics of the CP 440

The CP 440 startup is divided into two phases:
Initialization (CP 440 in POWER ON mode)
Parameterization
Initialization
As soon as voltage is applied to the CP 440, all the module components are put
into the initial state and initialized.
Parameterization
During parameterization, the CP 440 receives the module parameters assigned to
the current slot, which were created using the CP 440: Point-to-Point
Communication, Parameter Assignment parameterization interface.
Parameterization is carried out. The CP 440 is now ready for operation.
7-2
Point-to-point connection CP 440 Installation and Parameter Assignment
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