ABB PBA800 bus adapter controller for sale

Description

Property Characteristic / Value
Microprocessor MCF5475 ColdFire® 32-bit processor running at 256 MHz
Memory 4 Mbytes ROM; 64 Mbytes RAM; 2 Mbytes NVRAM
Power Requirements Typical: 1.05 A @ +5 VDC = 5.25 W
Maximum: 1.25 A @ +5 VDC = 6.25 W
Communication Ports CH 0 & 1: 2x 10/100 Mbps Ethernet TCP/IP, CAT 5e or better cable up to 100 m
Redundancy
Module
Ethernet
Via PBA800 and SPK800-RCL1 cable
PN800 redundancy is based on IEC-62439 – PRP v0
Tag Capacity 30,000 Tags
Data Security TwoFish 128-bit cypher
Operating Temperature 0 to +70° C (Ambient, requires forced air ventilation)
Relative Humidity 20% to 95%, 0°C (32°F) to 55°C (131°F) noncondensing
20% to 45% between 55°C and 70°C (158°F) noncondensing
Air Quality ISA S71.04 G1 (Standard), G3 (Optional)
Certifications CSA certified for use as process control equipment in nonhazardous locations
CE Mark EMC directive 2004/108/EC and LV directive 2006/95/EC

There are multiple nodes in the DCS system network, on the one hand, they are human-machine interface connection nodes, such as engineer station nodes and operator station nodes; On the other hand, it is a node that connects to the central processing unit.
The main manifestations of network communication failures are: server crashes, operator station disconnects or crashes, decentralized processing unit crashes, redundant controller control failure, communication interruption, etc.

▶ Fault analysis:
In addition to unreasonable software design and network congestion, network communication failures are mainly caused by the following reasons:
① In the process of transmitting data, if a node asks for data, but other nodes lack relevant data, the inquiry instructions will be repeated, leading to network congestion;
② The network communication medium is damaged;
③ The DCS configuration operation is not standardized and there is no reasonable implementation of I/O connections. During the process of reading data, network congestion is caused by overload;
④ After software upgrade, the driver and hardware do not match;
⑤ Excessive memory usage of historical data can lead to frequent network congestion during peak data transmission periods, resulting in crashes and other issues at various sites;
⑥ The temperature of the DCS hardware working environment is too high (often caused by a cooling system malfunction).

▶ Fault handling:
At present, there is no low-cost and effective method to reduce network communication load and solve network congestion. It is still difficult to solve this problem through daily maintenance and repair. Therefore, the main treatment method is to improve the level of daily maintenance. The daily maintenance methods are:
① Frequent network testing, increase the frequency of network testing, identify abnormal operating conditions of the unit based on the communication load rate with all systems, strengthen network monitoring, adjust data transmission time, and reduce network load during redundancy switching;
② During the maintenance process, reset the DPU and data station, delete invalid I/O, and remove influencing factors;
③ Adopting a double-layer network structure component DCS system to separate the system network and management network, improving the stability of network operation;
④ Regularly inspect the hardware working environment, check if its cooling system is operating normally, and check if all interfaces are working properly;
⑤ The direct data transmission of each system adopts a one-way transmission protocol;
⑥ Adding CRT to temperature signal detection to achieve abnormal alarm and avoid temperature abnormalities affecting system operation;
⑦ Before upgrading drivers and software, carefully consider the degree of matching between software, drivers, and hardware to ensure the normal operation of the unit and system.