Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 141 / 198

Operating Modes, parameters and commands
7.4 Measuring modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
141
Limit Monitoring
The following value ranges are permitted for limit value monitoring:
Table 7- 33 Frequency Measurement: Value Ranges for Limit Monitoring
Encoder type Low limit f
u
High limit f
o
5-V encoders 0 to 499 999 999 × 10
-3
Hz f
u
+1 to 500 000 000 × 10
-3
Hz
24-V encoders 0 to 199 999 999 × 10
-3
Hz f
u
+1 to 200 000 000 × 10
-3
Hz
Possible Measuring Ranges with Error Indication
Table 7- 34 Frequency Measurement: Measuring Ranges and Errors
Frequency f
min
Absolute error Frequency f
min
Absolute error
0.1 Hz ±0.001 Hz 1 000 Hz ±0.18 Hz
1 Hz ±0.001 Hz 10 000 Hz ±1.8 Hz
10 Hz ±0.003 Hz 100 000 Hz ±18 Hz
100 Hz ±0.02 Hz 500 000 Hz ±90 Hz
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))
Function of Digital Output DO0
You can choose between the following functions for digital output DO0:
●
No comparison (no switching by limit value monitoring)
● Measured value outside limits
● Measured value under low limit
● Measured value above high limit
(See the section Behavior of the Digital Outputs (Page 153))