167 Publication 1766-RM001A-EN-P - October 2008
Chapter
7
Relay-Type (Bit) Instructions
Use relay-type (bit) instructions to monitor and/or control bits in a data
file or function file, such as input bits or timer control-word bits. The
following instructions are described in this chapter:
These instructions operate on a single bit of data. During operation, the
processor may set or reset the bit, based on logical continuity of ladder
rungs. You can address a bit as many times as your program requires.
XIC - Examine if Closed
XIO - Examine if Open
Instruction Type: input
Use the XIC instruction to determine if the addressed bit is on. Use the
XIO instruction to determine if the addressed bit is off.
Instruction Used To: Page
XIC - Examine if Closed Examine a bit for an ON condition 167
XIO - Examine if Open Examine a bit for an OFF condition 167
OTE - Output Enable Turn ON or OFF a bit (non-retentive) 169
OTL - Output Latch Latch a bit ON (retentive) 170
OTU - Output Unlatch Unlatch a bit OFF (retentive) 170
ONS - One Shot Detect an OFF to ON transition 171
OSR - One Shot Rising Detect an OFF to ON transition 172
OSF - One Shot Falling Detect an ON to OFF transition 172
B3:0
0
B3:0
0
Execution Time for the XIC Instruction
Controller When Instruction Is:
True False
MicroLogix 1400 0.2646 µs 0.2512 µs
Execution Time for the XIO Instruction
Controller When Instruction Is:
True False
MicroLogix 1400 0.2513 µs 0.2775 µs
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