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Instruction Manual
IM-106-880C, OI
Section 7: Foundation
Fieldbus
April 2017
Mode
s
15
3
7.13.2
Modes
The ARTHM block supports the following modes:
•
Manual (Man) – The block output (OUT) may be set manually.
•
Automatic (Auto) – OUT reflects the analog input measurement or the simulated value
when simulation is enabled.
•
Out of Service (O/S) – The block is not processed. FIELD_VAL and PV are not updated
and the OUT status is set to Bad: Out of Service. The BLOCK_ERR parameter shows Out
of Service. In this mode, you can make changes to all configurable parameters.
The target mode of a block may be restricted to one or more of the supported modes.
7.13.3
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit set. The types of block
error for the ARTHM block are defined above. Alarms are grouped into five levels of priority
(
Table 7-33 Alarm Level Priorities
Priority Number Priority Description
0
The priority of an alarm condition changes to 0 after the condition that caused the alarm is corrected.
1
An alarm condition with a priority of 1 is recognized by the system, but is not reported to the operator
2
An alarm condition with a priority of 2 is reported to the operator, but does not require operator
attention (such as diagnostics and system alerts).
3-7
Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
8-15
Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.
7.13.4
Block Execution
The Arithmetic function block provides range extension and compensation through nine (9)
arithmetic types.
There are two inputs (IN and IN_LO) used in calculating PV. PV is then combined with up to three
inputs (IN_1, IN_2, and IN_3) through the user selected compensation function (ARITH_TYPE)
to calculate the value of func. A gain is applied to func and then a bias is added to get the value
PRE_OUT. In AUTO, PRE_OUT is used for OUT.
Range Extension and Calculation of PV
When both IN and IN_LO are usable, the following formula is applied to calculate range
extension for PV:
PV = G * IN + (1 - G) * IN_LO
(G has a range from 0 to 1, for IN from RANGE_LO to RANGE_HI.)
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Страница 192: ...Section 7 Foundation Fieldbus April 2017 Instruction Manual IM 106 880C OI 16 6 About AMS and DeltaV Software ...
Страница 205: ...Alarm Relay Events April 2017 Instruction Manual IM 106 880C OI 17 8 Alarm Relay Events ...
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Страница 304: ...Index April 2017 Instruction Manual IM 106 880C OI 27 8 Manual index ...
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