Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 92)

Operating Functions
Chapter 5
5–55
Important: You must use an Interrupt Control CALL 9 after a PROG
command to re-enable interrupts.
This routine enables system interrupts. It is mandatory after programming
a PROM. The wall clock is accessible and the peripheral port is enabled.
All of the input call conversion routines require the same sequence of
commands. These are:
PUSH – the word position of the processor block-transfer-file to be
converted (1–64)
CALL – the appropriate input conversion
POP – the input argument into a variable
The data format of the output arguments from each of the input conversion
routines is described in more detail in Chapter 7.
5.7.9.1
3-Digit Signed, Fixed Decimal BCD to Internal Floating Point
"XXX –
CALL 10
The input argument is the number (1 to 64) of the word in the
write-block-transfer buffer that is to be converted from 3-digit BCD to
internal format. The output argument is the converted value in internal
floating point format. The sign bit is bit number 16.
5.7.9.2
16-Bit Binary (4-digit hex) to Internal Floating Point – CALL 11
The input argument is the number (1 to 64) of the word in the
write-data-transfer buffer to be converted from 16-bit binary to internal
format. The output argument is the converted value in internal floating
point format. There are no sign or error bits decoded.
5.7.9.3
4-Digit Signed Octal to Internal Floating Point
"XXXX – CALL 12
The input argument is the number (1 to 64) of the word in the processor
block-transfer buffer to be converted from 4-digit signed octal to internal
format. This 12-bit format has a maximum value of
"7777 octal. The
output argument is the converted value in internal floating point format.
The sign bit is bit number 16.
5.7.8
Enable Interrupts – CALL 9
5.7.9
Input Call Conversion
Routines