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

1Count5V

3.8 Fast mode

3.8.2 Fast mode
Definition
In this mode, the 1Count5V counts continuously starting from the start value:
When counting up, if the 1Count5V 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 1Count5V 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 198)")
● Synchronization on positive edge (see chapter "Synchronization (Page 199)")
● HW enable for synchronization (see chapter "Synchronization (Page 199)")
3.8.3

Gate function in the case of fast mode

Hardware Gate
The 1Count5V has a HW gate, which can be controlled via the digital input on the 1Count5V.
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.
198
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07