Allen-Bradley 1771-AF Fiber-Optic Converter Module

Allen-Bradley 1771-AF Fiber-Optic Converter Module Description:

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Allen-Bradley 1771-AF Fiber-Optic Converter Module

Allen-Bradley 1771-AF Fiber-Optic Converter Module

Allen-Bradley 1771-AF Fiber-Optic Converter Module

 

Mfr. Part Number:	1771-AF
Manufacturer:	Allen-Bradley / Rockwell Automation
Description:	Allen-Bradley 1771-AF Fiber-Optic Converter Module
Full Description:	Allen-Bradley 1771-AF Fiber-Optic Converter Module; Allows DH+ and Remote I/O signals to travel over fiber-optic cable for routing through electrically noisy environments; converts twinax electrical signals to light (for transmission over fiber-optic cable), and then converts the light back to electrical signals (for transmission on twinax). Supported Communication Rates: 57,600 bit/s and 115,200 bit/s; Current Load: 600 mA. Fits into one slot of 1771 I/O chassis
UPC / GTIN:	10612598001139
Status:	Discontinued by manufacturer

This is an inverted normally open contact.
When used with a hardwired input, this instruction is "true" until there is a voltage
applied to the input. It then goes low, or off, and becomes “false.”
It also can be used with an internal coil, becoming true when the coil is off and
becoming false when the coil is on.
Allen-Bradley calls these normally closed contacts “XIO”, or “eXamine If Open”
instructions. 
When used with a hardwired output, this function is off until the logic in the program
allows it to turn on. It then becomes “true”, and will energize the device that is wired to
the respective output.
If it is used as an internal coil, it will toggle the instructions associated with it. That is, it
will close a normally open instruction and open a normally closed instruction.
Allen-Bradley calls these outputs “OTE”, or “OutpuT Energize”.
An OTE may be used with a hardwired output or an internal coil.
TRUE – A state that indicates an instruction is allowing logic to “flow” through it.
Also, if the logic in a rung turns on the output of the rung, then the rung is said to be
true.
FALSE - Without stating the obvious, this is the opposite of true.
OK, that was a lot to cover and for you to understand – don’t worry, this will start getting
easier. 

Suppose we want to use a PLC to operate a pilot light. In its elementary form, PLC logic
is very similar to the hard-wired logic you would find in an electrical ladder diagram.
For example, if you wanted to turn on a light with a momentary pushbutton, you would
wire it like the circuit below. When you press PB1, the pilot light PL1 lights up. 
Now let's do the same thing in a PLC. To duplicate the hardwired circuit on a PLC, you
would wire the switch PB1 to an input (let’s use Local:4:I.Data.3) and wire the light PL1
to an output (Local:7:O.Data.0).
The I/O (hardwired inputs and outputs) is set up like this:
 - There is a “PB1” pushbutton switch wired to Local:4:I.Data.3 of the PLC.
- There is a “PL1” pilot light wired to Local:7:O.Data.0 of the PLC.
In RSLogix 5000, the screen would look like this

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