AO02 AO01 HART Analog Output Module

Description

New I/O for 2014 – Tentative for 4th qtr
AI02 – 8 Channel input isolated with Hart
AI05 – 16 Channel input 4-20 with Hart
AO02 – 8 Channel isolated output with Hart
AO05 – 16 channel output with Hart
AD01 – CIS22 (4AI w/hart, 2AO w/hart, 4DI w/SOE, 4DO – 24/48 volts
DD01 – 16 DI(24/48 vdc),16 DO(24/48vdc)
DO02 – 16 DO(24/48 vdc) w/short circuit

protection:
Redundant I/O
Vertical Bases – Harmony Block
CI850 – IEC61850 IED interface/goose
CI800 – DNP and IEC61870-5 interface

The power supply of the DCS system is also a factor that causes DCS failures. Firstly, there is a power failure that causes the DCS system to malfunction. If the power switching time is too long, it can also cause the DCS to crash (the power switching time should be less than 3 ms). Power supply is a major source of interference in the DCS system. The main way to prevent power interference is to connect the ground wire properly (the grounding resistance should be less than 2 ms).

The incomplete grounding system of the DCS system is very easy to cause DCS false signals. In environments with high voltage, large power supply, and strong electromagnetic interference, it is necessary to pay attention to the grounding system. The unit within the system has experienced multiple unexplained false signals, which is related to the poor grounding system. OVA ION controller power supply characteristics: redundant power supply; The pulse feeding of the secondary transistor ensures continuous power supply; Maintaining a continuous output of 32 ms after a complete AC power outage is twice the power supply of a typical DCS system; Select the minimum potential (resistance value within 1 ms) to ground. Strengthen the management of DCS system software. The backup management of software and databases is an important task for DCS when maintaining the DCS system, and staff should follow the regulations when doing this work. Pay attention to integrity when reinstalling or upgrading software. Don’t forget to confirm the IP address for dual network card computers.

The DCS system equipment should be inspected on time to eliminate faults in the bud, prevent them from igniting, improve the reliability of the DCS system, keep track of the system’s operating status at all times, establish a fault history account, and summarize experience. Attention should also be paid to the anti-interference of the DCS system. The interference of walkie talkies and mobile phone signals on the DCS system is unquestionable, with the difference in power and distance. Although the technical specifications for distributed control systems in thermal power plants require that electromagnetic interference and radio frequency interference with a working frequency of 470 MHz and a power output of 5W emitted from 1-2 meters away from electronic equipment should not affect the normal operation of the system. However, it is generally difficult to confirm the power of the interference source, and in order to ensure absolute safety, it is still necessary to explicitly stipulate that no wireless communication tools are allowed to be used within the entire range of the electronic room, and high-power communication tools are restricted to be used in the space near the DCS system.

Establishing a reasonable maintenance cycle, equipping appropriate spare parts, and arranging appropriate maintenance personnel are the basic requirements for stable operation of the control system. It is emphasized here that for any version of DCS control system from any manufacturer, emergency handling and shutdown measures for DCS faults must be developed. In addition, it is necessary to solve the problem of I/0 initialization after computer restart in the OVATION system, as well as the important safety operation and protection of the unit. Especially, all boiler safety monitoring and protection subsystems in the OVATION system must be designed as soft logic.

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