# GE System I/O - PowerPoint PPT Presentation

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GE System I/O . MAIN 222 Industrial Controllers. Introduction . See Unit 4 Course Manual Info %I is an input %Q is an output %M is an internal bit An internal bit is a contact or location that is memory / virtual in nature. Contacts.

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GE System I/O

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## GE System I/O

MAIN 222

Industrial Controllers

### Introduction

• See Unit 4 Course Manual Info

• %I is an input

• %Q is an output

• %M is an internal bit

• An internal bit is a contact or location that is memory / virtual in nature

### Contacts

• A contact is used to monitor the state of a machine or internal reference.

• Whether or not the contact passes “flow” depends on status of the reference being monitored and type of contact.

Normally Open = Reference is On 1

Normally Closed = Reference is Off 0

### Contacts

• Types of Coils

• Unit 9-5 HO

• Retentive

• Non-retentive

• Power Off then Back On Stays the Same That is Retentive

• SET

• RESET

### Types Of Contacts

• %Q

• Discrete machine outputs

• Non-Duplicated

• %M

• Internal Discrete References

• Not Retentive

• Can be Duplicated

• %T

• Temporary Internal References

• Not Retentive

• Can be Duplicated

### Relay Elements

• Unit 9-7

• Go over 9-8 Example

• Siemens

• E = In

• A = Out

• GE

• I = In

• Q=Out

• TI

• X = In

• Y = Out