Siemens SIMATIC S5 Manual page 293

IP 266
9.2 Switches, Indicators and Flags in the Sample Programs
Maintained-contact/momentary-contact switches
All control elements for the program are interfaced over IB 3 and IB 4. Some
inputs require only momentary-contact switches, while others require main-
tained-contact switches. Inputs I 3.0 to I 4.7 are listed in the table below.
Input
I 3.0 External start enable (IP pin 7)
I 3.1 START
I 3.2 STOP
I 3.3 FORWARD
I 3.4 REVERSE
I 3.5 TRANSFER
I 3.6 Override 100 % / 50 %
I 3.7
I 4.0 Selector switch for mode 5
I 4.1 Selector switch for mode 2
I 4.2 Selector switch for mode 6
I 4.3 Selector switch for mode 8
I 4.4 Selector switch for mode 9
I 4.5 Absolute target specification
+360.800 mm / -360.600 mm
I 4.6
I 4.7 Continuous operation for mode 7
(brief example in Section 9.5)
EWA 4NEB 812 6057-02
Maintained-
Function
STEP 5 Programming
Momentary-
contact contact
switch switch
• NC contact
• NO contact
• NO contact
• NO contact
• NO contact
• NO contact
•
• NO contact
• NO contact
• NO contact
• NO contact
• NO contact
•
• NO contact
Function
9-5