When using the counter module FM350-1, with the parameters given below, it might happen that although the software gate SW_GATE closes, the internal gate STS_GATE remains open and for this reason the counter group shows no function. The following parameterization leads to this behavior:
- Single count mode
- Counting range 0 to 32 bits
- Gate function failure
- Load value 0
As soon this parameterization sets the software gate SW_GATE to FALSE, counting is interrupted. If the software gate SW_GATE is set to TRUE again, the load value 0 is loaded. This makes the counter module FM350-1 recognize the counting range limit of 0 and counting stops, the STS_GATE remains FALSE and counter value remains 0.
You must change one of the following settings to remedy this behavior.
- Select periodic counting instead of single count mode
- Select a counting range of -31bits to +31bits instead of 0 to 32 bits
- Select a load value not equal to 0