Siemens FM 450-1 - Page 69

4
1
2
3
4
Counter status
Count pulses
Open gate
Close gate
Input1I0
Figure 8-4 Level controlled opening and closing of the HW gate of counter 1
If you set input 1I0 to 1 the count signals can reach counter 1 and are counted. If you reset input
1I0 to 0, the door is closed. The count pulses are no longer counted, counter 1 stops.
If the gate of counter 1 is closed owing to over󹪞ow or under󹪞ow, you must 󹪝rst reset input 1I0
and apply a positive edge to input 1I0 to reopen the door.
Edge controlled opening and closing of the HW gate
The following 󹪝gure shows the edge controlled opening and closing of the HW gate of counter
1.
4
1
2 3
4
Counter status
Count pulses
Open gate
Close gate
Input 1I0
Input 1I1
Figure 8-5 Edge controlled opening and closing of the HW gate of counter 1
With the edge controlled door function the HW gate of counter 1 is opened by a positive edge
on input 1I0. The door is closed by a positive edge on input 1I1.
If positive edges occur simultaneously on inputs 1I0 and 1I1 an open gate is closed or a closed
gate remains closed. If input 1I1 is set a positive edge on input 1I0 cannot open the gate.
The same applies analogously to counter 2 (inputs 2I0 and 2I1).
Status of inputs 1I0 (2I0) and 1I1 (2I1)
The status of the inputs 1I0 (2I0) and 1I1 (2I1) are indicated by the green LEDs CH1 IN 0 (CH 2
IN 0) and CH 1 IN 1 (CH 2 IN 1) and, within the user program, in the STS_STA and STS_STP bit of
the DB of the FC°CNT_CTRL.
Gate status
The gate status is indicated in the STS_GATE bit within the user program.
Modes, settings, parameters and commands
8.10 Command: Open and close gate
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 69