Specifications

SIMATIC Instructions
9-169
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Enable Interrupt, Disable Interrupt
The Enable Interrupt instruction globally enables
processing of all attached interrupt events.
The Disable Interrupt instruction globally disables
processing of all interrupt events.
Operands: None
Data Types: None
When you make the transition to the RUN mode,
interrupts are initially disabled. Once in RUN mode, you
can enable all interrupts by executing the global Enable
Interrupt instruction. The global Disable Interrupt
instruction allows interrupts to be queued, but does not
allow the interrupt routines to be invoked.
Communication Port Interrupts
The serial communications port of the programmable logic controller can be
controlled by the LAD or STL program. This mode of operating the
communications port is called Freeport mode. In Freeport mode, your program
defines the baud rate, bits per character, parity, and protocol. The receive and
transmit interrupts are available to facilitate your program-controlled
communications. Refer to the transmit/receive instructions for more information.
I/O Interrupts
I/O interrupts include rising/falling edge interrupts, high-speed counter interrupts,
and pulse train output interrupts. The CPU can generate an interrupt on rising
and/or falling edges of an input. See Table 9-21 for the inputs available for the
interrupts. The rising edge and the falling edge events can be captured for each of
these input points. These rising/falling edge events can be used to signify a
condition that must receive immediate attention when the event happens.
L
A
D
S
T
L
ENI
ENI
DISI
DISI
F
B
D
ENI
DISI
222 224
333
221