ABB NBRA-657C Chopper

The first system alarm or plaintext message entered in the message line output buffer is displayed on the monitor. A blinking “M” in the message line indicates that the message buffer contains more than one message. A “V” indicates that more than 10 messages have been issued. Message line output is always performed at the end of the basic cycle. Printer output System alarms are logged on a separate printer, independant of any monitor output.The first system message stored in the cyclic buffer is entered in the output buffer if space is available (cf. Chapter 7.2.1.6). – Plaintext messages (MEL block), – operator input messages, or – system alarms can be entered in the output buffer. Information stored in the output buffer is transferred to the logging printer.

Bus output

The system generates a standard message from the message stored in the output buffer (see Fig. 7.10) which is transferred through direct memory access to the N8. The N8 transmits the system messages to all subsystems logged on for this purpose after it has obtained the master function.

A subsystem, which is to receive system alarms, can be logged on to or logged off from the individual devices (e.g. AS 235). Up to 8 receiver systems can be logged on (and off) to (from) an AS 235 device for 

– system alarms

 – operator input messages

 – plaintext messages and/or 

– status messages.

Acknowledgement by QM

 The operator presses the QM key on the process communication keyboard (keygroup 4, Fig. 2.12) to acknowledge system alarms or configured plaintext messages (MEL/PKF block) displayed in the message line. The same function can be achieved by pressing the keys Q, M, and ; on the configuration keyboard (cf. Fig. 2.11). After entering QM (message line acknowledgement) on the process communication keyboard or Q, M, and ; on the configuration keyboard, the displayed message disappears and the next message is displayed. All other messages waiting in the message buffer can be displayed and acknowledged in the same manner.

Do you want to know about our products?

We have a large amount of inventory and high quality, out of production control system components, DCS system accessories, robot system accessories, large servo system spare parts. PLC module, DCS module, CPU module, IO module, DO module, AI module, DI module, network communication module, Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module, redundancy module, power module, relay output module, relay input module, processor module and other major brands.