Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 204

Sequence Input Instructions
Applicable Program Areas
Operand Specifications
Description
164
Block program areas
OK OK
Area
CIO Area CIO 000000 to CIO 614315
Work Area W00000 to W51115
Holding Bit Area H00000 to H51115
Auxiliary Bit Area A00000 to A95915
Timer Area T0000 to T4095
Counter Area C0000 to C4095
Task Flag Area TK0000 to TK0031
Condition Flags ER, CY, N, OF, UF, >, =, <, >=, <>, <=, ON, OFF, AER
Clock Pulses 0.02 s, 0.1 s, 0.2 s, 1 s, 1 min
TR Area ---
DM Area ---
EM Area without bank ---
EM Area with bank ---
Indirect DM/EM ---
addresses in binary
Indirect DM/EM ---
addresses in BCD
Constants ---
Data Registers ---
Index Registers ---
Indirect addressing ,IR0 to ,IR15
using Index Registers
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
LD NOT is used for the first normally closed bit from the bus bar, or for the first
normally closed bit of a logic block. If there is no immediate refreshing specifi-
cation, the specified bit in I/O memory is read and reversed. If there is an
immediate refreshing specification, the status of the Basic Input Unit's input
terminal is read, reversed, and used.
LD NOT is used in the following circumstances as an instruction for indicating
a logical start.
• When directly connecting to the bus bar.
• When logic blocks are connected by AND LD or OR LD. (Used at the
beginning of a logic block.)
The AND LOAD and OR LOAD instructions are used to connect in series or in
parallel logic blocks beginning with LD or LD NOT.
At least one LOAD or LOAD NOT instruction is required for the execution con-
dition when output-related instructions cannot be connected directly to the
bus bar. If there is no LOAD or LOAD NOT instruction, a program error will
occur with the program check by the Peripheral Device.
When logic blocks are connected by AND LOAD or OR LOAD instructions, the
total number of AND LOAD/OR LOAD instructions must match the total num-
ber of LOAD/LOAD NOT instructions minus1. If they do not match, a program-
ming error will occur.
Step program areas Subroutines
OK
LD NOT bit operand
Section 3-3
Interrupt tasks
OK