Siemens CP 243-2 Operations Instructions download pdf (Page 22)

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Parameterisation

Usually, slaves are not parameterised.

Only intelligent slaves with required op-

tions are parameterised. The data sheet

of the slave in question defines whether

it has to be parameterised and what

function the parameters have. Whereas

the address of a slave never changes in

normal operation, the parameters are

very likely to change. We therefore

make the distinction between variable

and fixed parameters.

Fixed parameters are defined only once

during configuration. The parameters

themselves are bits, of which four are

made available to each module, each of

which can be set to 0 or 1. They are

transferred to the slaves when the sys-

tem is started up.

Operation

As soon as the AS-Interface system is

set up, i.e. all the components have

been installed, the slaves are addressed

and, where necessary, parameterised,

and configuration is complete, it’s time

to start: The system switches to normal

operation, and the master runs in pro-

tected mode.

Only the slaves that have been config-

ured are activated. Slaves that are not

configured – e.g. those that have been

added subsequently – merely return an

error signal. All you have to do to include

such a slave in the communications net-

work is to switch to configuring mode.

The function “Configure slaves” sees to

that. It’s as easy as that.

The system is constantly monitored,

both when it is started up for the first

time and during normal operation. The

necessary data, such as voltage, mode,

incorrect configuration etc., is sent to

the higher-level controller by the AS-In-

terface master, e.g. in the form of a di-

agnosis.

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