![]() This allows ladder logic to examine input values more often than once every cycle. ![]() The IIT (Immediate Input Terminal) function allows inputs to be read after the input scan, while the ladder logic is being scanned. Normally closed: power flows when the input X is not open. Normally open: an active input X will close the contact and allow power to flow. The first two are normally open and closed inputs, discussed previously. Figure 7.7(b) shows the three types of inputs. ![]() PLC inputs are easily represented in ladder logic. ![]() Relay ladder logic representations: (a) a seal-in circuit (b) ladder logic inputs (c) ladder logic outputs.
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