ZYGO 7724 Displacement interferometer

The working field can be used to retrieve data related to – process control, such as area display, group display, loop display, special plant display or to – configuration, such as block list, processing sequence, storage allocation.– Operator input errors This field is used for displaying an error code directly related to the current operator input, or a disable code (***) for the current operator position. – Area message field The symbol “ ” (code 127) appears next to the sign BR in this field, if an alarm signal is waiting in a block with normalized representation. The system administers the first character after “BR”. The second through twelvth character after “BR” must be activated via GB. ORPA.194 through GB.ORBA.204.

Name of the last block to have been defined 

The name of the last block to have been defined is displayed in this field. In an AS 235 subsystem, specified blocks need not be installed immediately in a processing sequence. – Processing level selected Blocks are always installed in or removed from a processing sequence, and a block sequence output, with reference to the processing level selected. – Name of the last block to have been installed The name of the last block to have been installed is displayed in this field.

The current control mode is indicated in this field BE Operator–process communication (cf. Chapter 2.3.4.2) NEMO Creating new function blocks (cf.Chapter 5.3/ 5.4) NEDA Creating data records BUS–bta For QF operation via CS 275 bus subsystem to bus device no.“bta” BS Signal in the target AS when configuration is performed via the bus

Instructions used for 

- process control (via process communication keyboard) or - configuration(via configuration keyboard) are displayed in this field. The input line is shortened when configuration is performed via the bus: – the first 5 digits indicate input errors from automation systems which are to be configured; – the bus/device number of the automation system that is to be configured is displayed in the subsequent columns – Operation indicator of local floppy disk a.) a static sign “FD” indicates floppy disk operation; b.) a blinking sign “FD” indicates a malfunction during floppy disk operation.

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