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GFK-0467K Contents ix
Application Fault......................................................................................................3-12
No User Program Present .........................................................................................3-13
Corrupted User Program on Power-Up ....................................................................3-13
Password Access Failure..........................................................................................3-13
PLC CPU System Software Failure..........................................................................3-14
Communications Failure During Store.....................................................................3-16
Section 3: I/O Fault Table Explanations........................................................ 3-17
Loss of I/O Module.........................................................................................................3-17
Addition of I/O Module ..................................................................................................3-18
Chapter 4 Series 90-30/20/Micro Instructions Set.............................................................. 4-1
Section 1: Relay Functions ............................................................................... 4-2
Using Contacts............................................................................................................4-2
Using Coils .................................................................................................................4-3
Normally Open Contact —| |— .................................................................................4-4
Normally Closed Contact —|/|—...............................................................................4-4
Example: .............................................................................................................4-4
Coil —( )—................................................................................................................4-4
Example: .............................................................................................................4-4
Negated Coil —(/)— .................................................................................................4-4
Example: .............................................................................................................4-4
Retentive Coil —(M)—.............................................................................................4-5
Negated Retentive Coil —(/M)— .............................................................................4-5
Positive Transition Coil —(↑)—...............................................................................4-5
Negative Transition Coil —(↓)— .............................................................................4-5
Example: .............................................................................................................4-5
SET Coil —(S) — .....................................................................................................4-6
RESET Coil —(R)—.................................................................................................4-6
Example: .............................................................................................................4-6
Retentive SET Coil —(SM)— ..................................................................................4-7
Retentive RESET Coil —(RM)—.............................................................................4-7
Links...........................................................................................................................4-7
Example: .............................................................................................................4-7
Continuation Coils (———<+>) and Contacts (<+>———)...................................4-8
Section 2: Timers and Counters....................................................................... 4-9
Function Block Data Required for Timers and Counters...........................................4-9
ONDTR ....................................................................................................................4-11
Parameters:........................................................................................................4-12
Valid Memory Types: .......................................................................................4-12
Example: ...........................................................................................................4-13
TMR .........................................................................................................................4-14
Parameters:........................................................................................................4-15
Valid Memory Types: .......................................................................................4-15