Siemens SITRANS PCS 7 Function Manual page 153

● L_AOB_Act = 1
Fill level out of bounds for the "Outside band" alarm
● Fr_AH_Act= 1:
Flow high alarm limit ON has been reached or exceeded, but flow high alarm limit OFF has
not yet been undershot
● Fr_AL_Act= 1:
Flow low alarm limit ON has been reached or undershot, but flow low alarm limit OFF has
not yet been exceeded
You can use Feature bit 29 (signal limit overshoot/undershoot) to determine whether the
output parameter triggers limit monitoring with the value "0" or "1".
You may use Feature bit 28 (Disabling operating points) to disable limit monitoring while
message suppression is active (MsgLock = 1).
Activating limit monitoring
Monitoring is always enabled using the input parameters:
● L_AH_En = 1: Monitoring of the high alarm limit of the fill level
● L_AL_En = 1: Monitoring of the low alarm limits of the fill level
● L_AIB_En = 1: Monitoring of the "Within band" alarm limits of the fill level
● L_AOB_En = 1: Monitoring of the "Outside band" alarm limits of the fill level
● Fr_AH_En = 1: Monitoring of the high alarm limit of the flow
● Fr_AL_En = 1: Monitoring of the low alarm limit of the flow
● T_AH_En = 1: Monitoring of the high alarm limit of the temperature can be configured in the
block (but there is no message from the block in WinCC!)
● T_AL_En = 1: Monitoring of the low alarm limit of the temperature can be configured in the
block (but there is no message from the block in WinCC!)
Predefinition: All monitoring functions are activated.
Message suppression
The corresponding message is suppressed using the parameters:
● L_AH_MsgEn = 0:
Message of the fill level alarm (high) is suppressed.
● L_AL_MsgEn = 0:
Message of the fill level alarm (low) is suppressed.
● L_AIB_MsgEn= 0:
Message of the "Within band" alarm of the fill level is suppressed.
● L_AOB_MsgEn= 0:
Message of the "Outside band" alarm of the fill level is suppressed.
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
SITRANS LUT400
6.1 Lut400
153