Programming IDEC SmartRelay
48
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 as-
sign parameters just like you do with the other three inputs.
To create a circuit logic in IDEC SmartRelay, start at the out-
put.
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 make contact S3 is interconnected in series to
output Q1 and to a further circuit element. A series connec-
tion corresponds with the AND block:
Step 2: S1 and S2 are connected in parallel. A parallel circuit
corresponds with the OR block:
Unused inputs
The circuit program automatically assigns the unused con-
nectors a status that ensures proper functioning of the rele-
vant 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 the IDEC SmartRelay .
I3
x
Q1
&
I3
x
Q1
&
≥
1
I1
I2
x
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
