Controllers: Direct vs. reverse-acting control - Control Global
WEBMar 14, 2014 · A: Direct action means that the controller output rises if the measurement increases. Indirect (reverse) action means that the controller output drops when the measurement rises. A: Not quite right. The control valve failure action (and sometimes the valve positioner action) is also relevant.
Lambda Tuning -- the Universal Method for PID Controllers in …
WEBOct 22, 2013 · Lambda tuning gives non-oscillatory response with the response time (Lambda) required by the plant. Seven industrial examples show the relevance and simplicity of this method.
Top 50 Automation Companies of 2021: Green Muscles In
WEBNov. 8, 2022. The Top 50 global and North American automation suppliers fend off recession with sustainability and digitalization. Larry O'Brien, Chantal Polsonetti, Mike Guilfoyle. The automation marketplace proved its resilience again in 2021 and returned to pre-pandemic levels. Despite advances in project engineering that reduced cycle times ...
FISCO is Fortified Intrinsic Safety - Control Global
WEBJun 3, 2010 · The Fieldbus Intrinsically Safe Concept (FISCO) provides the live working benefits of Intrinsic Safety (IS) without many of the limitations associated with the intrinsic safety (IS) entity techniques. These burdens usually include extensive calculations and restrictive power limitations, which are two main reasons why FISCO often is selected ...
How valve failure modes interact with controller actions and …
WEBDec 9, 2021 · The controller action is selected for the total loop (Figure 1) to always have negative feedback (RA). Each RA (180° phase shift) in the loop causes a sign reversal, while each DA results in no phase shift. In terms of the total loop, this means that if both the valve and the process are DA (phase shift = 0) or if both are RA (phase shift -180 ...
How to specify valves and positioners that don’t compromise control
WEBMar 18, 2016 · Loop Control Distributed Control PLCs & PACs SCADA Multivariable Control Industrial Computers AI & ML. Manipulate. Motors Valves Actuators Drives. Visualize. HMI Operator Interface Alarm Management Recorders Data Acquisition Mobile Access. Network. Wireless Industrial Networks I/O Systems Power Supplies Remote Access. Manage.
Good grounding practices - Part 1 | Control Global
WEBNov 13, 2018 · Loop Control Distributed Control PLCs & PACs SCADA Multivariable Control Industrial Computers AI & ML. Manipulate. Motors Valves Actuators Drives. Visualize. HMI Operator Interface Alarm Management Recorders Data Acquisition Mobile Access. Network. Wireless Industrial Networks I/O Systems Power Supplies Remote Access. Manage.
Lishen Battery, Siemens scale sustainable battery production
WEBAug 14, 2023 · Tianjin Lishen Battery Joint-Stock Co., Ltd. which researches, develops and produces lithium-ion batteries, announced Aug. 8 that Siemens Digital Industries Software will help it establish a technology center. As part of the collaboration, Lishen Battery, which is controlled by state-owned and private investors, will use Opcenter software from ...
How history, principles and standards led to the safety PLC
WEBMay 17, 2016 · The SIL 1 safety system is the most commonly used, and provides risk reduction in the range from 10:1 to 100:1. In the process industries, the highest SIL rating normally used is SIL 3. SIL 4 is only used under very special circumstances such as nuclear plants. SIL levels 1 to 3 represent a coarse scale of safety performance for the SIS.
To cascade or not to cascade? - Control Global
WEBNov 8, 2021 · A common decision is whether to keep or incorporate a cascade such as a TC to FC. Due to the faster execution in the DCS or PLC (often one second or less), a cascade will normally provide better disturbance rejection capability than the MPC. It will also allow a greater turndown ratio of the MPC, allowing reliable MPC control over a …