Siemens SIMATIC S5 Equipment Manual page 42

Operating Instructions
2.5
GeneraI Interrupt Processing with thePLCS5–115U
With the programmable controller S5–115U, the interrupt lines in general are available for inter-
rupt processing.
Via the peripheral byte O it then can be established which module(s) has (have) triggered the inter-
rupt on the line.
The 1P 241 issues an interrupt by activating the interrupt line (e.g., by outputting a low signal). This
is performed in the central unit directly and via interface IM 307/31 7 with light wave conductor cou-
pling for expansion device ER 701–3 or EG 186U.
Interrupt organization for S5-115U
(*with CPU 941A only l~and
Interrupt for one 1P 241 module
if only one module (IP 241) is used per interrupt line (IRA to IRD), the peripheral byte O must be
disabled (DIP switch S2.1 to S2.1O open) and the interrupt lines must be defined by the corre-
sponding DIP switch S1 setting.
In the CPU, a hardware interrupt on the interrupt line causes a jump to a firmly assigned interrupt
– IRA to OB2
– IRB to OB3
– IRC to OB4
– IRD to OB5
One interrupt IR line is assigned to an 1P 241 module.
The DIP switches for the interrupt IR lines not used by this module must be opened! (Section
2.5.2)
. j When the peri heral b e O is used, the address O may not be used in the P–area ~ ~
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Interrupt lines
Peripheral byte O
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