—
4
Application planning
4.1 Processor module and I/O selection
How to select modules for your automation task: In our main
catalog we of
fer a CPU selector
and several comparative tables to find the modules for your application.
Reference documentation for hardware
4.2
Communication within the PLC
The synchronized serial I/O bus is the I/O data bus for the I/O modules connected with the
processor modules or communication interface modules. Through this bus, I/O and diagnosis
data are transferred.
With its fast data transmission, the I/O bus obtains very low reaction times.
Up to 10 I/O terminal units (for one I/O module each) can be added to one terminal base or
to one AC500-eCo processor module. The I/O terminal units and the AC500-eCo I/O modules,
have a bus input at the left side and a bus output at the right side. Thus the length of the I/O bus
increases with the number of attached I/O modules
Ä
Table 1 “Maximum number of I/O devices
which can be connected to the I/O bus” on page 25.
1 I/O bus connection
The connection of the I/O bus is performed automatically by telescoping the modules on the DIN
rail. The I/O
bus provides the following signals:
● Supply voltage of 3.3 V DC for feeding the electronic interface components
● 3 data lines for the synchronized serial data exchange
● several control signals
NOTICE!
Except when using hot swap terminal units, the
I/O bus is not designed for
pulling and plugging modules during operation. If a module is pulled or plugged
on a terminal unit that is not hot swap capable while the bus is running, the
following consequences are possible
– reset of the station or of the processor module
– system lockup
– damage of the module
Communication within the PLC
2023/03/033ADR011074, 1, en_US24
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