Function blocks
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MN05013005E
161
6: actual value plus offset
• Range A: Compare
>I1
>
>I2
– The actual value
>I1
increases.
– The contact switches when the actual reaches the setpoint
value.
– The actual value changes and falls below the value of the
setpoint value minus the hysteresis.
– The contact goes to the normal position.
• Range B: Compare
>I1
<
>I2
– The actual value drops.
– The contact switches if the actual reaches the setpoint value.
– The actual value changes and rises above the value of the
setpoint value plus hysteresis.
– The contact goes to the normal position.
• Range C: Compare
>I1
>
>I2
with offset
– This example behaves as described in Range A. The offset
value is added to the actual value.
• Comparison
>I1
=
>I2
The contact switches on:
– If the setpoint is exceeded with the actual value rising.
– If the setpoint is undershot with the actual value decreasing.
The contact switches off:
– If the hysteresis limit is exceeded with the actual value rising.
– If the hysteresis limit is undershot with the actual value
decreasing.
Arithmetic function block
EZD provides 32 arithmetic function blocks AR01 to AR32.
The arithmetic function block is used for arithmetic operations.
All four basic arithmetic operations are supported:
• add,
• subtract,
• multiply,
• divide.
