Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 231)

6 Application Instructions API 00-49
DVP-PLC Application Manual 6-19
API Mnemonic Operands Function
11 D ZCP P Zone Compare
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices Word Devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * * * * * * * * * *
S
2
* * * * * * * * * * *
S * * * * * * * * * * *
D * * *
ZCP, ZCPP: 9 steps
DZCP, DZCPP: 17 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
1
: Lower bound of zone comparison S
2
: Upper bound of zone comparison S: Comparison value
D : Comparison result
Explanations:
1. If S
1
, S
2
and S are used in device F, only 16-bit instruction is applicable.
2. The content in S
1
should be smaller than the content in S
2
.
3. Operand D occupies 3 consecutive devices.
4. See the specifications of each model for their range of use.
5. S is compared with its S
1
, S
2
and the result is stored in D.
6. When S
1
> S
2
, the instruction performs comparison by using S
1
as the lower/upper bound.
7. The two comparison values are compared algebraically and the two values are signed binary values. When b15
= 1 in 16-bit instruction or b31 = 1 in 32-bit instruction, the comparison will regard the value as negative binary
values.
Program Example:
1. Designate device M0, and operand D automatically occupies M0, M1 and M2.
2. When X0 = On, ZCP instruction will be executed and one of M0, M1, and M2 will be On. When X0 = Off, ZCP
instruction will not be executed and M0, M1, and M2 remain their status before X0 = Off.
X0
M0
M1
M2
ZCP
If C10 < K10, M0 = On
If K10 < C10 < K100, M1 = On
If C10 > K100, M2 = On
X0
K10 C10 M0 K100
= =
3. To clear the comparison result, use RST or ZRST instruction.
X0
RST M0
RST
RST
M1
M2
X0
ZRST M0 M2