Fast Mode; Overview - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count24V

2.8 Fast mode

2.8 Fast mode
2.8.1

Overview

Introduction
This mode is suitable for position detection is especially short isochronous cycles.
This mode encompasses a subset of the functionality of the continuous counting mode.
It is intended for isochronous mode and differs from continuous counting by having a lower
TDP Module
input module, i.e., there is no control interface in this operating mode.
This mode is available starting with FW Version V2.0 of the module. The module must be
configured as "1Count24V Fast Mode V2.0" in HW Config.
You can find the parameter assignment for "Fast Mode" in the chapter "Assigning
parameters for fast mode (Page 89)".
Maximum Count Range
A total of 25 bits are available for the count value.
Load Value
You can specify a load value for the 1Count24V.
This load value is applied directly as the start value.
Gate Control
To control the 1Count24V, you can use the HW gate.
State according to Parameter Assignment
Count value corresponds to the load value set in HW Config.
Isochronous Mode
In each cycle, the 1Count24V transfers the counter satus and the status bits that were valid
at time T
84
and a TWA equal to zero. The module is operated in this mode as a pure
min
.
i
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07