Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 105)

PM550 CIM Requirements

A-2

TIWAY 1 TI505 NIM User Manual

NOTE

All Siemens tap housings contain factory-installed termination

resistors.

If the T

ap Housing is not used to terminate the Local Line,

the

terminating resistors must be removed when the output cable is

attached.

A.3.1 Networks

with Switch-biased Devices and CIMs

On networks using devices with the bias switch, CIMs, and self-biased devices, a bias

must

be applied to the line using the switch-biased device as described in the previous

section. All CIMs on the network should be positioned somewhere between the two

outermost

switch-biased devices. (See Chapter 2.)

erminate the network according to the instructions in Chapter 2.

A.3.2

Networks with Only Self-biasing Devices and CIMs

On networks using devices without the bias switch, bias must be applied to the Local

Line

by the CIM. T

o accomplish this, proceed as follows:

1. On

networks having only one CIM, place this CIM at one end of the Local Line

trunk, and install the jumpers provided with the CIM in accordance with the

instructions in the PM550 CIM User’s Manual, Manual Number

PM550–1101154–4.

This will apply the correct bias to the Local Line to prevent

oscillations

of the CIM receivers.

terminate the Local Line, replace the existing terminating resistors inside the

CIM T

-T

ap housing. Connect 150-ohm resistors between the LLM+ and the cable

shield,

and also between LLM– and the cable shield. This resistance value is 150

ohms in each instance, and the connection is made in accordance with

instructions

inside the tap

housing. The combination of termination resistors in

the

CIM, together

with these 150-ohm resistors, provide the correct Local Line

termination. Then, terminate the other end of the local line as described in

Chapter

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