Peripheral Functions
Chapter 8
86
During automatic or program verification, the processor will identify
discrepancies between memory content and the content on the cassette
tape. By pressing [SEARCH] 9 on the PLC-2 family overlay, the number
of program and data table discrepancies found and whether or not the data
table was verified will be displayed. Up to 19 discrepancies can be
detected.
Each program discrepancy can be searched for and located by pressing
[SEARCH] and a number from 01 to 19. Each time a discrepancy is
searched for, the rung containing it will be displayed with the cursor
positioned on the instruction that doesn’t match the corresponding message
on tape. A hard copy printout of the tape program is required for visual
comparison. If the Processor memory is in error, it can be corrected using
the editing procedure described in Section 4.4.4.
This function can be terminated at any time by pressing the [CANCEL
COMMAND] key.
The 1770-SB data cartridge recorder is a peripheral device used for
program storage and retrieval. It connects to channel C of the industrial
terminal and uses a magnetic data cartridge tape to record (dump), load and
verify processor memory.
The data cartridge recorder can be operated from the industrial terminal
keyboard. It can also be operated in the same manner as a 1770-SA digital
cassette recorder using both the recorder control panel and the industrial
terminal keyboard. In either case, the baud rate switch in the data cartridge
recorder must be set to 1200.
It should be noted that when a data cartridge tape is inserted and the
recorder is on, the recorder will automatically rewind the tape to correct
tape tension. This process should not be confused with the dump, load or
verify operation.
Remote operation of the data cartridge recorder from the industrial
terminal keyboard is discussed in the following paragraphs. For operation
in the same manner as a digital cassette recorder, refer to Section 8.3.
Data table, user program and messages can be recorded onto a data
cartridge tape and the transfer verified by a single command from the
industrial terminal. The processor should be in program mode to ensure
that the data table values are not changing.
Once the cursor is positioned on the first instruction in user program, the
cartridge dump command is initiated by pressing [RECORD] [SHIFT] [B].
8.3.5
Displaying and Locating
Errors
8.4
Data Cartridge Recorder
8.4.1
Dumping Memory Content
onto Data Cartridge Tape
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