Festo — MSE6-C2M — 2022-08b
Functions
19
Monitoring of upper pressure critical limit
A comparator is used to compare the measured pressure value with the upper pressure limit value,
Pm.13-14, parameter. When the time set in the monitor limit values startup, Pm.7, parameter has
elapsed and limit value monitoring is activated, Pm.0.6, the appropriate error/diagnostic message is
output if a limit value is exceeded.
Monitoring of parameters
The unit pressure, Pm.8.0-8.1, lower pressure limit value P2, Pm.25-26, upper pressure limit value,
Pm.13-14, limit value monitoring startup, Pm.0.7, parameters are check for permissible values on
input. In the event of an error, the corresponding error message is output if parameterisation error
monitoring is activated, Pm.0.7.
Sensor monitoring
If there is a sensor error, the appropriate error message, which cannot be deactivated, is output.
Unit
pressure
Pm.8.0-8.1
Upper
critical limit
pressure
Pm.13-14
Monitoring
of
critical limit
startup
Pm.7
Monitoring
of
critical limits
Pm.0.6
Monitoring
of
parameter
Pm.0.7
Data
check
Data
check
Data
check
Comparator
Diagnostics, maskable
FN24, Em.2: parameterisation error low. critical limit
FN25, Em.2: parameterisation error upp. critical limit
FN29, Em.2: error in parameterisation
Input
Em.2: pressure P2
Diagnostics, maskable
FN10, Em.2: upp. critical limit exceeded
Diagnostics, not maskable
FN15, Em.2: sensor defective
Pressure P2
(MSE6-D2M)
Scaling
Status LED P2
Lower
critical limit
pressure
P2
Pm.25-26
Comparator
Data
check
Input
Em.3.6: status monitoring P2_UGR
P2
pressure
sensor
sensor
error
Fig. 9: Block diagram of the “Pressure” function
5.1.4
Pressure change
5.1.4.1
Measurement method
The pressure change DP2 is determined cyclically at intervals of the parameterisable pressure change
sample time DT. When calculating the pressure change, the difference between the current measured
pressure value and the measured pressure value DT, based on the pressure change sample time P2, is
calculated: DP2 = P2(t) – P2(t-DT); t = current measuring point.
The start of the measuring cycle to calculate the pressure change is automatically synchronised with
the activation signal of the shut-off valve. The current pressure change value DP2 remains constant
up to the next measuring time. Every time the unit, Pm.8, parameter is written, a re-synchronisation
follows.
