Cutler-Hammer D50 - Mul, Dmul, Mulb, Dmulb

80 D50 PLC User's Manual
Instruction
Mnemonic Multiplication Range
 Bit
■ Byte
MUL
DMUL
MULB
DMULB
Decimal multiplication (MUL,
DMUL)
BCD multiplication (MULB,
DMULB)
■ Word
Ladder
D = S1 × S2
Decimal: S1 = 3 and S2 = 7
Hexadecimal: S1 = $03 and S2 = $07
MUL Example:
Decimal: 3 × 7 = 21
MULB Example:
BCD: $03
× $07 = $21
Description
1. Multiply the data in the S1 and S2 addresses, then store the result in the D register.
2. When using MUL and MULB, the calculation ranges are as follows:
 S1: 0 to 255 (0 to $FF)
 S2: 0 to 255 (0 to $FF)
 D: 0 to 255 (0 to $FF)
3. When using DMUL and DMULB, the calculation ranges are as follows:
 S1: 0 to 65,535 (0 to $FFFF)
 S2: 0 to 65,535 (0 to $FFFF)
 D: 0 to 65,535 (0 to $FFFF)
4. If the result exceeds the range of calculation, a carry occurs. The carry flag (F1.8) is changed
to On. The high word of the result that exceeds the range of D is automatically stored in
SR20.
5. This operation will occur on every scan for which the input condition is true (On). To perform
the operation only on a change of input condition, use the rising/falling edge contact.
Example
Program Expression Operation Results
Initial conditions: W0 = 00002 = $0002
W1 = 00030 = $001D
W2 = 00006 = $0006
W3 = 00500 = $01E4
Operation results: W10 = 00012 = $000C
W11 = 15000 = $3A98
W12 = 00018 = $0012
MUL
D =
S1 =
S2 =
R
R
MULB
D =
S1 =
S2 =
MUL
D = W10
S1 = W0
S2 = W2
DMUL
D = W11
S1 = W1
S2 = W3
MULB
D = W12
S1 = W0
S2 = W2
R0
R
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