Siemens SIMATIC TD 200, User Manual

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B-5
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
Network Connectors
Siemens offers two types of networking connectors that you can use to connect
multiple devices to a network easily. Both connectors have two sets of terminal
screws to allow you to attach the incoming and outgoing network cables. Both
connectors also have switches to bias and terminate the network selectively. One
connector type provides only a connection to the CPU. The other adds a
programming port (see Figure B-4).
Network Bus Connector with Programming Port Connector, Vertical Cable
Outlet (order number 6ES7 972–0BB11–0XA0)
Network Bus Connector (no programming port connector), Vertical Cable Outlet
(order number 6ES7 972–0BA11–0XA0)
The connector with the programming port connection allows a SIMATIC
programming device or operator panel to be added to the network without
disturbing any existing network connections. The programming port connector
passes all signals from the CPU through to the programming port. This connector
is useful for connecting devices (such as a TD 200 or an OP3) which draw power
from the CPU. The power pins on the communication port connector of the CPU
are passed through to the programming port.
!
Caution
Interconnecting equipment with different reference potentials can cause unwanted
currents to flow through the interconnecting cable.
These unwanted currents can cause communication errors or can damage
equipment.
Be sure all equipment that you are about to connect with a communication cable
either shares a common circuit reference or is isolated to prevent unwanted
current flows. See “Grounding and Circuit Reference Point for Using Isolated
Circuits” in Section B.3.
Multiple CPU Configurations