Rockwell-automation 1760-xxxx Pico Controller User Manual Uživatelský manuál stáhnout pdf (Strana 183)

Publication 1760-UM001D-EN-P - September 2005

Use of Expansion Modules 9-5

Module Status Example

Power can be applied to the expansion unit later than it is applied to

the Pico controller. This means that Pico is switched to Run with the

expansion module missing. The Pico circuit diagram below detects

whether the expansion unit is operational or not.

As long as I14 = 1, the remaining circuit diagram is skipped. If I14 = 0,

the circuit diagram is processed. If the expansion module drops out

for any reason, the circuit diagram is skipped. M1 detects whether the

circuit diagram was processed for at least one cycle after the power

supply switched on. If the circuit diagram is skipped, all the outputs

retain their previous state. The next example should be used if this is

not desired.

Example with LCD Output and Reset of the Outputs

-----------SM1

I14--------[:8

I1-I2------[Q1

Q1

I14-M1-----[:8

-----------SM1

I14--------[:8

I1-I2------[Q1

Q1

I14-M1-----[:8

I14--------[:8

:8---------[D1

RQ1

:8

I14--------[D1

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