FEC920: USER GUIDE
Page 82
September 18
MATHS FUNCTIONS
Off
Out = -9999; status = Off
Add
Out = Input2
Subtract
Out = Input1 - Input2
Multiply
Out = Input1 x Input2
Divide
Out = Input1 ¸ Input2. If Input2 = 0, Out = -9999; Status = ‘Bad’.
Group Avg*
Out = Instantaneous sum of all points in the recording group (except this one and any
channel that has been configured with operation = group average, group minimum, group
maximum, group minimum (latched), group maximum (latched), channel maximum or
channel minimum), divided by the number of points in the group (excluding this one).
Any point that has a status other than ‘Good’ is excluded from the calculation.
If the group contains no channels, Out = -9999; Status = ‘No data’.
Group Min*
Out = Instantaneous value of whichever point (except this one) in the recording group has
the lowest value.
Any point that has a status other than ‘Good’ is excluded from the calculation.
If the group contains no channels, Out = -9999; Status = ‘No data’.
Group Max*
Out = Instantaneous value of whichever point (except this one) in the recording group has
the highest value.
Any point that has a status other than ‘Good’ is excluded from the calculation.
If the group contains no channels, Out = -9999; Status = ‘No data’.
Modbus Input
Out = value written to this channel’s Modbus input.
If the comms timeout expires, Out = -9999; status = ‘No data’.
Copy
Allows an input or other derived channel to be copied.
Grp Min Latch*
Out = Lowest value reached by any point in the recording group (except this one) since
last reset.
Any point that has a status other than ‘Good’ is excluded from the calculation.
If the group contains no channels, Out = -9999; Status = ‘No data’.
Grp Max Latch*
Out = Highest value reached by any point in the recording group (except this one) since
last reset.
Any point that has a status other than ‘Good’ is excluded from the calculation.
If the group contains no channels, Out = -9999; Status = ‘No data’.
Channel Max
Out = Highest value reached by Input1 since last reset.
If Input1 has a status other than ‘Good’, then Out = -9999 and ‘Status’ depends on the
status of Input1.
Channel Min
Out = Lowest value reached by Input1 since last reset.
If Input1 has a status other than ‘Good’, then Out = -9999 and ‘Status’ depends on the
status of Input1.
Channel Avg
Out = the average value of Input1 over the time specified in ‘Period’.
If Input1 has a status other than ‘Good’, then Out = -9999 and ‘Status’ depends on the
status of Input1.
Config Revision
Out = current Configuration Revision value.
Note:
* All ‘Group’ functions operate on the ‘Recording’ group, not on the ‘Trend’ group.
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