This category includes a module template for an analog input monitor with alarms, a discrete input monitor with an alarm, and a pulse input monitor with alarms. It also contains an analog alarm module that can reference an external parameter, such as the output of an FFMAI_RMT function block connected to an 848T fieldbus transmitter.
The analog monitoring module consists of an Analog Input function block and five alarm parameters for HighHigh, High, Low, LowLow, and PV Bad alarms. As a default, only the PV Bad alarm is enabled.
Parameter |
Description |
|---|---|
HI_LIM |
The high alarm limit value in engineering units. This is a Quick Config parameter because the HI_ALM alarm parameter is initially enabled. |
IO_IN |
An I/O Reference parameter for configuring the DST for the process variable input. |
L_TYPE |
Linearization type. The default is Indirect. This might be changed to Ind Sqr Root, for example, when flow is being determined from differential pressure. |
LO_LIM |
The low alarm limit value in engineering units. This is a Quick Config parameter because the LO_ALM alarm parameter is initially enabled. |
OUT_SCALE |
This parameter is used to set the engineering unit value at 0 percent and 100 percent of scale for the process variable. The engineering unit descriptor can be selected from a list and the number of decimal places to be displayed can be set. Note that the number of decimal places to be displayed is applicable only for the faceplate and detail displays. The valid values for these displays are 0 to 3 decimal places. |
Note that the only permitted target mode for the AI function block is AUTO.
The discrete monitoring module consists of a discrete input function block and an alarm parameter.
Parameter |
Description |
|---|---|
DISC_LIM |
The alarm state, 1 or 0, for PV_D. If DISC_LIM is the default 1, an alarm condition is detected when PV_D is 1. DISC_LIM can be set to a value greater than 1 when neither state results in an alarm condition. The valid range for input is 0 to 255. |
IO_IN |
An I/O Reference parameter for configuring the DST for the discrete input. |
IO_OPTS |
This parameter can be used to invert the value of the input channel to calculate PV_D. The only I/O option applicable in this module is Invert. |
Note that the only permitted target mode for the DI function block is AUTO.
The pulse monitoring module consists of a Pulse Input function block and five alarm parameters for HighHigh, High, Low, LowLow, and PV Bad alarms. As a default, the HIGH, LOW, and PV Bad alarms are enabled.
Parameter |
Description |
|---|---|
HI_LIM |
The high alarm limit value in engineering units. This is a Quick Config parameter because the HI_ALM alarm parameter is initially enabled. |
IO_IN |
An I/O Reference parameter for configuring the DST for the process variable input. |
LO_LIM |
The low alarm limit value in engineering units. This is a Quick Config parameter because the LO_ALM alarm parameter is initially enabled. |
OUT_SCALE |
This parameter is used to set the engineering unit value at 0 percent and 100 percent of scale for the process variable. The engineering unit descriptor can be selected from a list and the number of decimal places to be displayed can be set. Note that the number of decimal places to be displayed is applicable only for the faceplate and detail displays. The valid values for these displays are 0 to 3 decimal places. |
PULSE_VAL |
The factor used to convert pulses to engineering units. |
TIME_UNITS |
Determines the factor used to convert from seconds to the desired time units. |
The analog alarm module consists of an Alarm Detection (ALM) function block and seven alarm parameters for HighHigh, High, Low, LowLow, DevHigh, DevLow, and PVBad alarms. As a default, the High, Low, and PVBad alarms are enabled.
Parameter |
Description |
|---|---|
HI_LIM |
The high alarm limit value in engineering units. This is a Quick Config parameter because the HI_ALM alarm parameter is initially enabled. |
IN_SCALE |
This parameter is used to set the engineering unit value at 0 percent and 100 percent of scale for the process variable. The engineering unit descriptor can be selected from a list, and the number of decimal places to be displayed can be set. Note that the number of decimal places to be displayed is applicable only for the faceplate and detail displays. The valid values for these displays are 0 to 3 decimal places. |
IO_IN |
An I/O Reference parameter for configuring the DST for the process variable input. |
LO_LIM |
The low alarm limit value in engineering units. This is a Quick Config parameter because the LO_ALM alarm parameter is initially enabled. |
SP |
The target value for the process variable |