Siemens CP 243-2 Instruções de Operação descarregar pdf (Página 11)

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With Version 2.1 you can operate up to 62

slaves instead of the previous 31 on one

AS-Interface network. This works as fol-

lows: The 31 addresses that are possible

and available in a standard AS-Interface net-

work are split into two independent subad-

dresses - e.g. in 1A and 1B. If you use this

option for all 31 slaves, a total of 62 stations

are possible. To take advantage of this new

specification a new range of compatible AS-

Interface masters and slaves are available.

The new V2.1 slaves – called A/B slaves –

have up to four input and three output ad-

dresses available. On the front of the new

modules, increased “easy-to-use” diag-

nostics are possible by means of LED’s.

Other added benefits of the new specifica-

tion are that improved transmission times

are now capable for analogue input or out-

put slaves. An AS-Interface network can

now consist of old and new slaves (i.e.

Standard and version 2.1 AS-Interface) al-

lowing upward and downward integration

of existing AS-Interface networks. This

means that existing applications can be ex-

panded with new V2.1 slaves and V2.1

masters can communicate with the exist-

ing slaves on a network. It must be re-

membered that masters that do not support

Specification 2.1, can only support standard

slaves and not the new A and B slave ad-

dresses. The actual principle of operation is

as follows: The standard slaves are polled

in each cycle (max. cycle time: 5 ms). Even

if only one A or B slave is installed at an ad-

dress, this slave is scanned in each cycle

with a maximum cycle time of 5 ms. If only

one A/B slave pair is installed at an address,

the A slave is scanned in one cycle, and the

B slave is scanned in the next (max. cycle

time: 10 ms). A/B slaves can be addressed

like standard slaves via all new commer-

cially available AS-Interface addressing units

that conform with the new Specification

2.1.It should be noted that any AS-Interface

addressing units that do not conform with

the new Specification 2.1 can only re-ad-

dress A/B slaves as an A slave.

AS-Interface Version 2.1

Network topology

The AS-Interface network can be con-

figured like any conventional electrical

installation. Due to the robust function-

ing principle behind the structure, any

network topology can be used. Tree,

bus, or star topologies are possible.

More AS-Interface with new

Specification

In an AS-Interface system configured

and designed according to Specification

2.1, up to 62 A/B slaves can be con-

nected. The slaves have the capability

of having 4 input and 3 output ad-

dresses maximum (i.e. up to 248 inputs

and 186 outputs within an AS-Interface

system). In a standard AS-Interface sys-

tem up to 31 slaves can be connected,

each slave having up to 4 inputs and up

to 4 outputs (i.e. a total of 124 inputs

and 124 outputs).

Intelligent sensors with integrated AS-

Interface chips each have their own

slave address and are interpreted as

“normal” slaves by the master.

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