188 D320 PLC User's Manual
Register LED’s
The six register LED’s indicate which address type is being displayed, when displaying a data value or
address. The possible register types are R for external I/O, M for internal contacts, K for internal
retentive (Keep) contacts, F for system flags, W for data words, and TC for timer/counter done
contacts.
Address/Data LED Display
The address/data LED display is a 5-digit 7-segment display capable of showing numerical and
character data. The display is used to show data values, register addresses, and step addresses.
• A 5-digit value is displayed to represent either a bit address (where the first three digits are the
word, and the last two are the bit), or a constant value that is a parameter for an instruction.
• A 4-digit value represents a word address for a register
• Function numbers and timer/counter channel numbers are represented with the first two
characters being Fn and ch, respectively.
• When displaying a step address in the mnemonic program, periods appear to the bottom-right
of each digit in the 5-digit address.
Instruction Keys
There are 12 instruction keys on the pocket editor that are used for entering the 25 basic instructions on
the D50 PLC. To enter certain of the basic instructions, more than one of the instruction keys may be
combined. Refer to the Basic Instruction table at the end of this appendix for details.
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