1.1 What Is The Et 200 Distributed I/O System; System Overview - Siemens SIMATIC S5 Manual

System overview

1.1 What is the ET 200 distributed I/O system?

What is ET 200?
What does ET 200
consist of?
What is a DP
master?
Which DP masters
can I use?
Which hosts can I
use?
What is a DP
slave?
1-2
When a conventional system is set up, the I/O modules are usually grouped
together in the programmable controller.
If the inputs/outputs are distant from the programmable controller, the
cabling may be complex and cumbersome, while reliability may be impaired
by disruptive electromagnetic fields.
Under these circumstances, Siemens recommends the use of the ET 200
distributed I/O system. The controller CPU is located at a central point, the
inputs and outputs are distributed so as to be at their most efficient, and the
high- performance ET 200 bus system with its high data-transfer rates
ensures excellent communication between the CPU and the I/O stations.
The distributed I/O system consists of active (master) and passive (slave)
stations interconnected by the SINEC L2 DP field bus.
ET 200 also includes the COM ET 200 Windows parameterization software
which enables you to set up and commission the distributed configuration.
A master which functions in compliance with the patterns defined in DIN E
19245, Part 3, is known as a DP master.
The following may act as DP masters (active stations) in the distributed I/O
system:
IM 308-B or IM 308-C master interfaces. Both these modules are
compatible with the S5-115U, S5-135U and S5-155U programmable
controllers.
S5-95U programmable controller with DP master interface.
Other Siemens DP masters.
Other-vendor DP masters.
A host is a device or a system which contains the IM 308-C. The S5-115U,
S5-135U and S5-155U programmable controllers can function as the host for
the IM 308-C.
You can operate a maximum of 32 hosts on a SINEC L2 DP bus.
A slave operating on the SINEC L2 bus with the SINEC L2 DP protocol is
known as a DP slave.
A DP standard slave is a slave operating with the SINEC L2 DP protocol on
the SINEC L2 bus and functioning in accordance with standard DIN E
19245, Part 3.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a