IDEC FL1E SmartRelay - Manual (Page 78)

Programming IDEC SmartRelay
64 IDEC SmartRelay Manual 
Note
Although you have four inputs available for logic operations (Basic
functions, see Chapter 4.2), most of the views will only show three
inputs for reasons of clarity. You program this fourth input and 
assign parameters just like you do with the other three inputs.
To create a circuit logic in IDEC SmartRelay, start at the
circuit output.
The output is the load or relay that is to be switched.
Convert the circuit logic into blocks by working through the
circuit, starting at the output and ending at the input:
Step 1: The Normally Open Contact S3 is interconnected in
series to output Q1 and to a further circuit element.
A series connection corresponds with the AND
block:
I3
x
Q1
&
Step 2: S1 and S2 are connected in parallel. A parallel circuit
corresponds with the OR block:
I3
x
Q1
& 1
I1
I2
x
Unused inputs
The circuit program automatically assigns the unused
connectors a status that ensures proper functioning of the
relevant block. If you like, you can label unused connectors
with an ’x’ identifier.
In our example we shall use only two inputs of the OR block
and two inputs of the AND block; the relevant unused third
and fourth inputs are identified at the connector with an ’x’.
Now connect the I/Os to IDEC SmartRelay.
Wiring
Connect the switches S1 to S3 to the screw terminals of your
IDEC SmartRelay :
• S1 to connector I1 of IDEC SmartRelay
• S2 to connector I2 of IDEC SmartRelay
• S3 to connector I3 of IDEC SmartRelay
The output of the AND block controls the relay at output Q1.
The load E1 is connected to output Q1.