6. Function blocks
6.2 Interrupt function blocks
6.2.3.4 Other
Retention
The function block does not recognize retentive data.
The interrupt program does not have any retentive data.
Monitoring the interrupt load
In total, no more than 8 interrupt sources are allowed to be processed in a single pro-
gram. The valid interrupt sources are the IC, IE, IT interrupt function blocks and the
CF, CH, and CI high-speed counters that are directly connected to the device inputs.
For more information, please refer to → "CF - Frequency counter", page 310, → "CH -
High-speed counter", page 316 , → "CI - Incremental counter", page 322 as well.
For function blocks IE01 – IE08 and IC01 – IC08, device inputs I01 – I08 can be
assigned freely.
For function blocks IT01 – IT08, an interrupt that is not yet in use is assigned in
easySoft 8. The interrupt sources used by the CF, CH, and CI high-speed counters are
also considered to be in use within this context.
Each device input and each interrupt source can only be used once.
Exceptions:
l
For CI01, the instance of I02 can be used by an IT interrupt function block.
l
For CI02, the instance of I04 can be used by an IT interrupt function block.
l
For each interrupt function block IC, the instance of the second input of an IT
function block can be used if the Counter with 2 counter inputs mode has not
been selected.
These exceptions are taken into account by the plausibility check and by the pro-
gram compilation routine in easySoft 8. The maximum number of 8 interrupts is also
taken into account within this context.
 Device inputs
 I01 I02 I03 I04 I05 I06 I07 I08
Interrupt source








CF01 frequency
counter
x







CF02 frequency
counter

x






CF03 frequency
counter


x





CF04 frequency
counter



x




CH01 high-speed
meter
x







CH02 high-speed
meter

x






easyE402/24 MN050009ENEaton.com
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