Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 147 / 198

Operating Modes, parameters and commands
7.4 Measuring modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
147
Limit Monitoring
The following value ranges are permitted for limit value monitoring:
Table 7- 39 Value Range for Limit Monitoring at a Resolution of 1 µs
Low limit T
u
High limit T
o
0 to 119 999 999 μs T
u
+1 to 120 000 000 μs
Table 7- 40 Value Range for Limit Monitoring at a Resolution of 1/16 µs
Low limit T
u
High limit T
o
0 to 1 919 999 999 μs T
u
+1 to 1 920 000 000 μs
Possible Measuring Ranges with Error Indication
Table 7- 41 Period Measurement: Measuring Ranges and Errors at a Resolution of 1 µs
Resolution 1 µs
Period T
min
± Absolute error Period T
min
± Absolute error
1 μs* (10 ± 0) 1 μs* (100 000 ± 10)
1 μs* (100 ± 0) 1 μs* (1 000 000 ± 100)
1 μs* (1 000 ± 0) 1 μs* (10 000 000 ± 1 002)
1 μs* (10 000 ± 1) 1 μs* (100 000 000 ± 10 020)
Table 7- 42 Period Measurement: Measuring Ranges and Errors at a Resolution of 1/16 µs
Resolution 1/16 µs
Period T
min
± Absolute error Period T
min
± Absolute error
1/16 μs* (160 ± 1) 1/16 μs* (1 600 000 ± 160)
1/16 μs* (1 600 ± 1) 1/16 μs* (16 000 000 ± 1 600)
1/16 μs* (16 000 ± 3) 1/16 μs* (160 000 000 ± 16 000)
1/16 μs* (160 000 ± 20) 1/16 μs* (1 600 000 000 ± 160 000)
Function of the DI Start and DI Stop Digital Inputs
You can choose between the following functions for the digital inputs:
●
Level-controlled hardware gate
● Edge-controlled hardware gate
See section Command: Open and close gate (Page 149)