48 D50 PLC User's Manual
Basic Instructions
Mnemonic Command Ladder Symbol Description
STR Start Start NO contact.
STN Start Not Start NC contact.
AND And NO contact series circuit.
ANN (ADN) And Not NC contact series circuit.
OR Or NO contact parallel circuit.
ORN Or Not NC contact parallel circuit.
OUT Out
(OUT)
Relay output.
SET Set
(SET)
Turn On output.
RST Reset
(RST)
Turn Off output.
NOT Not Invert logic result.
STR DIF Start Differential R Start rising edge contact ( ).
STR DFN Start Dif. Not F Start falling edge contact ( ).
AND DIF And Dif. R Rising edge series connection ( ).
AND DFN And Dif. Not F Falling edge series connection ( ).
OR DIF Or Dif
R
Rising edge parallel connection ( ).
OR DFN Or Dif. Not F Falling edge parallel connection ( ).
ANB And Block Circuit block series connection.
ORB Or Block Circuit block parallel connection.
MCS Master Control Set (MCS) Start batch processing block.
MCR Master Control Reset (MCR) End batch processing block.
Note: NO = Normally Open
NC = Normally Closed
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