3-4
Driving the Display
PX 30 and PX 120 Operating Manual
A = 1 Display ASCll-coded variables
A = 0 Display binary or BCD-coded variables
? = 1 "?" flashes alternately with the lowest
value digit of the variable value
? = 0 "?" not inserted
_ = 1 "_" flashes alternately with the lowest
value digit of the variable value
_ = 0 "_" not inserted
N = 1 A negative prefix "-" is placed before
the variable value
N = 0 Display without negative prefix
C = 1 BCD-coding
C = 0 Binary-coding
If E3 = 0, binary coding is selected, if E3 = 1, BCD-coding is selected.
If BCD-coding is selected, the maximum number of BCD-digits per cycle will be transmit-
ted in parallel operation. The maximum number is 4 BCD-digits in 24-input mode and 2
BCD-digits in 16-input mode, provided the $M-configuration instruction has not been used
to reduce the number of digits which can be transmitted in parallel operation in BCD-
mode (see page 6-1).
Important: Input E3 has no function when BCD-coding is configured.
Please note:
• The configuration for the number of inputs used on the PX 120 (24 or 16-input-mode) is
described in the section entitled "Configuration" from page 6-1 onwards.
• If input E4 is latched, a negative prefix can be placed before a BCD-digit.
Binary mode operates with signed integers.
• The conversion of a positive binary integer into a negative binary integer of the same
value (taking into account the prefix coding in the highest value bit) is carried out as
follows:
7
0
A ?
_
N C
n n n
123456
Input
Variable Number
0 ... 7, binary coded
n n n
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