Bosch CL300 Manual page 90

System Modules
4.3.2 High−speed Interruptable Input Module IE 24− 16 Inputs
Function
Configuration
Operation as a 16−channel
High−speed Input Module
Operation as an
Interruptable Input Module
Interrupt Operation in the CL300
4−38
The IE module can be generally used as:
16−channel high−speed input module for the detection of short
D
input signals
8−channel high−speed and 8−channel interruptable input mod
D
ule for fast response to input signals with higher priority, according
to the equipment requirements. The operating modes can be se
lected on the module.
The IE module requires an external 24 V DC power supply.
It is not permitted to use the IE module address range for other I/O mod
ules.
The inputs are electrically isolated from the internal logic circuits through
optocouplers. A comparator circuit provides improved noise immunity at
the inputs. Each input is assigned an LED on the front panel.
The module is seen by the central processing unit like an ordinary 16−
channel input module. The high−speed input module is designed to
capture the signal states at the time when the card is scanned as well as
short signals which may occur during the remaining cycle time. These
are temporarily stored on the card when a positive edge transition is pre
sent at the inputs, and are automatically reset only when the ZE has read
the signals.
When scanning the signal states, the buffer memory is ORed to the cur
rent signal state. This ensures that input signals are safely detected.
When a positive signal transition occurs at one of the I inputs, the
signal is temporarily stored on the card, and a program interrupt request
is made to the ZE.
The ZE interrupts the current PLC program and changes to the organiza
tional module that is allocated to the interrupt input.
When using the IE module for interrupt operation in the CL300 Controller,
please note the following:
Flexible Automation