Siemens SIMATIC IM 151/CPU Manual page 179

B.33 ACCU Transfer Instructions, Incrementing, Decrementing
Status Word
The status word is not affected.
In-
Address
struc-
ID
tion
CAW Reverse the order of the bytes in
ACCU1–L
LL, LH becomes LH, LL.
CAD Reverse the order of the bytes in ACCU1
LL, LH, HL, HH becomes HH, HL, LH, LL.
TAK Swap the contents of ACCU1 and ACCU2
PUSH The contents of ACCU1 are transferred to
ACCU2
POP The contents of ACCU2 are transferred to
ACCU1
INC 0 to 255 Increment ACCU1-LL
DEC 0 to 255 Decrement ACCU1-LL
B.34 Program Display and Null Operation Instructions
Status Word
The status word is not affected.
In- Ad-
struc- dress
tion ID
BLD 0 to 255 Program display instruction;
Is treated by the CPU like a null operation
instruction.
The indicators are not affected.
NOP 0 Null operation instruction:
1 The indicators are not affected.
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Description
Description
Instruction List
Length
Typical Execution Time in
in
s
Words
1 0.3
1 0.6
1 0.8
1 0.3
1 0.3
1 0.3
1 0.3
Length
Typical Execution Time in
in
s
Words
1 0.3
1 0.3
0.3
B-45