Fast Mode; Gate Function In The Case Of Fast Mode - Siemens SIMATIC ET 200S Operating Instructions Manual

2.8.2

Fast mode

Definition
In this mode, the 1Count24V counts continuously starting from the start value:
When counting up, if the 1Count24V reaches the maximum value that can be represented
with 25 bits (all bits of the counter are set) and another count pulse arrives, the count value
jumps to "0" and resumes counting from there without losing a pulse.
When counting down, if the 1Count24V reaches the value "0" and another count pulse
arrives, the count value jumps to the maximum value that can be represented with 25 bits (all
bits of the counter are set) and resumes counting without losing a pulse.
Function of the Digital Input
For the "Function DI" parameter, select between the following functions:
Digital input off.
● Input
● HW gate (see chapter "Gate function in the case of fast mode (Page 85)")
● Synchronization on positive edge (see chapter "Synchronization (Page 86)")
2.8.3

Gate function in the case of fast mode

Hardware Gate
The 1Count24V has a HW gate, which can be controlled via the digital input on the
1Count24V.
You assign the hardware gate as the function of the digital input (Function DI "HW Gate"). It
is opened on a positive edge at the digital input and closed on a negative edge.
If no HW gate is assigned, counting becomes active immediately.
The STS_GATE checkback signal indicates whether counting is active.
When the HW gate is opened, this causes counting to continue starting from the current
count.
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
1Count24V
2.8 Fast mode
85