Specifications

A-5
IP 240
EWA 4NEB 811 6120-02b
A.4 Interrupt Processing
The adapter casing converts S5 interrupts into S7 interrupt functions and in-
terrupt signals.
All of the S5 module’s interrupts are forwarded as (S7) process interrupts.
The interrupts are routed as follows:
S5 Interrupt Circuit S7 Interrupt Circuit
/INT A /I1
/INT B /I2
/INT C /I3
/INT D /I4
No new interrupts are generated while OD (OUTPUT DISABLE) is active
(for instance when the CPU is at STOP). Interrupts which were already pend-
ing are serviced. The falling edge of the OD signal resets the S7-specific in-
terrupt functions.
Whether or not the S7-specific interrupt functions are reset with the falling
edge of the OD signal depends on the S5 module (please refer to the relevant
manuals). In the case of S5 modules in which the falling edge of the OD sig-
nal does not reset an interrupt, a new interrupt is subsequently generated.
When an S5 module in the adapter casing generates an interrupt, the logical
address of that module in entered in the interrupt OB’s local data area.
An interrupt is acknowledged in the usual manner, that is, the same as in S5
systems (refer to the Manual or the Product Information for details). The
CPU automatically carries out the S7-specific additional interrupt functions.
Introductory
Remarks
Interrupt Routing
Interrupt During
Active OD
Ascertaining the
Interrupt-
Generating Module
Acknowledging an
Interrupt
Adapter Casing (S5 Adapter)