Siemens Simatic S7-400 - Manual (Page 553)

Interface Submodules
13-57
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
13.8.1 What Can the IF961-CT1 Interface Submodule Do?
Introduction
This section contains an overview of the functionality of the IF 961-CT1 interface
submodule.
This functionality is achieved using the relevant driver software.
What Can the IF 961-CT1 Interface Submodule Do?
The IF 961-CT1 interface submodule is a high-speed counter module. There is a
counter on the submodule that can operate in the following counting ranges:
• 0 to 4 294 967 295 or
• - 2 147 483 648 to + 2 147 483 647.
The maximum input frequency of the counter signals is 500 kHz (5 V) or
200 kHz (24V).
You can use the IF 961-CT1 interface submodule for the following counting tasks:
• Endless count
• Single up/down count
• Periodic up/down count
You can start and stop the count either via the user program or via external signals.
Comparison Values
You can store two comparison values on the submodule assigned to the two
outputs of the submodule. If the counter status reaches one of the comparison
values, the relevant output can be set to initiate control sequences directly in the
process.
Initial Value
You can specify an initial value (load value) for the IF 961-CT1. The counter is then
set to the initial value when a signal is present at the 24 V digital input on the
submodule.
Gate Functions
The count can be started and stopped in dependence on other events via gate
functions.
The IF 961-CT1 interface submodule has two gate functions:
• A software gate controlled via the program.
• A hardware gate controlled via the digital inputs of the interface submodule.