Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 15)

Installation

Chapter 2

23

CAUTION: To guard against unpredictable operation of the

PLC–3 processor, do not change the setting on any thumbwheel

switch while the 1775–KA module is powered–up.

Option Switches

Figure 2.2 shows a set of four option switches on the bottom edge of the

1775– KA module. Switches 1 and 2 are used when the PLC–3 controller

is programmed to operate in a backup configuration. Switch number 1

determines whether or not a fault in the 1775–KA module will cause the

primary PLC–3 controller to switch over to the backup PLC–3. Switch

number 2 determines whether or not the 1775–KA module will disable its

Data Highway port when the PLC–3 becomes deactive. Switch 3 is for

RS–232–C communication. Switch 4 is reserved for future use and

should always be left open (up, or off). Use Table 2.A below to determine

the appropriate switch setting:

Figure 2.2

Option

Switches

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 15