Справочник Пользователя для Siemens 505-2557
Advanced Function Programming
3-24
SIMATIC 505–2557 Installation and Operation Guide
Additional Information about Each Function (continued)
Overrange/Underrange flags
The overrange (WX52) and underrange
(WX53) flag bits are set any time the analog-to-digital converter (ADC)
saturates and cannot produce any higher value for positive inputs or lower
value for negative inputs.
saturates and cannot produce any higher value for positive inputs or lower
value for negative inputs.
NOTE: A zero input value is a reasonable input level of signal. It is not
uncommon for the input to go below zero and the sign bit to change. The
ADC will function below a value of zero until saturation.
uncommon for the input to go below zero and the sign bit to change. The
ADC will function below a value of zero until saturation.
When using more than one of the advanced functions, it is necessary to
understand the order in which these functions are performed in the
SIMATIC 505–2557 hardware. The order of precedence for these functions
is as follows:
understand the order in which these functions are performed in the
SIMATIC 505–2557 hardware. The order of precedence for these functions
is as follows:
1.
Scaling for low and high engineering units
2.
Filtering
3.
Alarm processing
4.
Peak and Valley hold measurements
5.
Averaging
Advanced
Function
Precedence
Function
Precedence