KROHNE IFC 090 i Converter FOUNDATION FIELDBUS - Manual (Page 37)

Supplementary Documentation Page 37 of 44
IFC090, IFC090 i with FF
IFC090-FF Configuration
IFC090 FF 01/2006
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The a.m. setpoint TOTAL_SP can be set by user to an arbitrary value and is writable in every Integrator Block
operation mode. It defines the reset or starting points for the Up- and Down-integration types.
RESET_IN and OP_CMD_INT can be used to initiate an operator controlled reset. While RESET_IN is an input
parameter, which can be linked to any discrete output parameter of another block, OP_CMT_INT is a contained
parameter, which only can be changed by a direct write.
For the Periodic integration type, it is necessary to define a time, the totalization is being reset. CLOCK_PER is
the parameter referenced for this time and interpreted as value with unit seconds. The user can set this
parameter to any arbitrary value.
5.4.6 Integrator Reset Strategies
Depending on the chosen type of Integration (see 5.4.5), the integrators support different kinds of reseting the
totalization (i.e. the value of output parameter OUT). In the following, possible reset strategies are described
subject to the integration type:
Up auto
There are two kinds of reset possible:
• Automatic Reset
Reference point is the value of TOTAL_SP. If the totalization, i.e. the OUT value, exceeds TOTAL_SP, it is
reset to zero (0.0). A snapshot of the value at which the reset happened is saved in parameter STOTAL6.
• Operator Reset
No integrator internal reference point is used, but an input signal coming from another block or the operator.
By writing ‘reset’ to parameter OP_CMT_INT, the operator is able to reset the totalization at any point in
time.
If the operator wants to define a control strategy for resetting the totalization, it can use the input parameter
RESET_IN. Connecting this parameter with a different block’s discrete output parameter makes is possible
to reset the totalization by sending a value not equal to zero (0) via this connection.
Up demand
Only one kind of reset is possible: Operator Reset. See ‘Up auto‘ above for details.
Down auto
Similar two Up auto, two kinds of reset are possible:
• Automatic Reset
Reference point is 0.0. If the totalization, i.e. the OUT value, falls below 0.0, it is reset to TOTAL_SP. A
snapshot of the value at which the reset happened is saved in parameter STOTAL7.
• Operator Reset
See ‘Up auto’, ‘Operator Reset’ for details.
6
This could be useful, since normally the totalization isn’t reset exactly with the value of TOTAL_SP, but with a value with an additional
amount of measurement quantity.
7
This could be useful, since normally the totalization isn’t reset exactly with the value of TOTAL_SP, but with a value with an additional
amount of measurement quantity.