Technical information

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Composition
Modicon STB distributed I/O
solution
Open and modular system
Composition of a Modicon STB island (1)
A Modicon STB island is made up of one or more segments comprising PDMs
(Power Distribution Modules) and I/O modules.
The island begins with a NIM network interface module and ends with a bus
terminator supplied with the NIM.
An island can be made up of a single segment or a primary segment and up to
6 expansion segments.
The island’s segments are chained by EOS (End Of Segment) and BOS (Beginning
Of Segment) internal bus expansion modules.
On each segment:
b Place the PDMs immediately to the right of the network interface modules or
expansion modules.
b Place the I/O modules to the right of the PDM module supplying them
with power.
b Each module (with the exception of the NIM network interface module), is held
in a xing base on the DIN rail.
Three module and base widths are possible. On the DIN rail, the overall width
needed for a segment is the sum of widths of the network interface module, the
bases and any bus terminator.
The bases provide continuity of the internal bus, auto-addressing of the modules,
and separated and isolated distribution of the internal power supplies, actuators
(outputs) and sensors (inputs).
The advantages of this arrangement are:
b Unplugging modules:
v When switched off (cold swap), modules can be unplugged very quickly
v When switched on (hot swap), I/O modules can be unplugged provided the
network interface module is the standard type
b Output power supply independent of inputs: For example, if an output power
supply is cut by a Preventa module, the inputs are still managed.
b Immunity of inputs: For example, the closing of power contactors (controlled by
outputs) does not disturb analog input measurements.
Network Interface Module (NIM):
This module manages communications on the island bus. It acts as a gateway for
exchanges with the eldbus or network master.
Various NIM network interface modules (only standard type) are available
for the following major eldbuses or industrial networks:
b Ethernet Modbus TCP/IP: Single or double port Network Interface Modules
b EtherNet/IP, Modbus Plus and Fipio: Only standard type NIM network
interface modules
b CANopen, I
nterBus, Modbus Plus, Fipio, Probus DP and DeviceNet
(1) For further information, please consult our “Modicon STB IP 20 distributed I/O” catalog
available on our website www.schneider-electric.com.
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