Onboard Interrupt Inputs - Siemens SIMATIC S5-90U System Manual

S5-90U/S5-95U
10

Onboard Interrupt Inputs

The S5-90U has one interrupt input (I 33.0). The S5-95U is provided with four separate interrupt
inputs (I 34.0 to I 34.3).
Please refer to Sections 3.3.4 and 3.3.5 for the interrupt input assignments of the S5-90U and the
S5-95U.
In the default DB1, all interrupt inputs are disabled. The interrupt function is not available unless you
parameterize, i.e. enable the interrupt inputs in DB1. The procedure will be described in the
following Section.
If you have programmed OB3, the PLC automatically branches to OB3 if an interrupt is called up. If
you have not programmed OB3, program execution will not be interrupted.
OB3 is described in Section 9.1.2.
10.1 Setting Parameters for Interrupt Inputs in DB1
To set interrupt parameters, enter the following items in DB1:
• Which interrupt input should trigger interrupt-driven program processing (S5-95U)
• Whether the interrupt input should react to the positive, the negative, or to both edges of a
pulse (S5-95U); in the S5-90U, the interrupt input I 33.0 reacts only to the positive edge of a
pulse.
Possible DB1 Parameters (S5-90U)
Table 10-1. Parameters for the Interrupt Inputs (S5-90U)
Parameter Argument
Block ID: OBI:
0
IP
Possible DB1 Parameters (S5-95U)
Table 10-2. Parameters for the Interrupt Inputs (S5-95U)
Parameter Argument
Block ID: OBI:
p
IP
p
IN
p
IPN or INP
p=0 to 3
You will find the procedures for setting, modifying and transferring the parameters in DB1 in
Chapter 9.
EWA 4NEB 812 6115-02b
Onboard Interrupt
Alarm, positive edge, I 33.0
Onboard Interrupt
Interrupt, positive edge, channel p
Interrupt, negative edge, channel p
Interrupt, positive and negative edge, channel p
Onboard Interrupt Inputs
Meaning
Meaning
10-1