Rockwell-automation 1791-XXXX Discrete I/O AC and DC Block I/O Input a Uživatelský manuál stáhnout pdf (Strana 53)

Installing Block I/O

Chapter 3

3-34

A termination resistor must be installed on the last block in a series.

Connect the resistor as shown in Figure 3.23.

Figure 3.23

Installing

the T

ermination Resistor

Termination

Resistor

Connect termination resistor across

terminals 6 (BLU) and 8 (CLR).

10835I

BLU

SHD

CLR

Refer to Table 3.A for proper

terminator for your application.

Output modules contain surge suppression circuitry for the block output

devices. The ac output modules provide an RC network to limit the

magnitude of voltage transients that may occur when a device is wired in

parallel or series with hard contacts. The dc output modules have clamping

diodes that shunt voltage transients to the power supply.

Important: We recommend that you use an additional suppression device

if an output module is being used to control an inductive device such as:

relays motor starters

solenoids motors

and is in series with or parallel to a “hard contact” such as:

pushbuttons selector switches

By adding a suppression device directly across the coil of an inductive

device, you will prolong the life of the output devices and switch contacts.

Figure 3.24 shows an output module with a suppression device.

Termination Resistor

Surge Suppression

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