Delta DVP-PLC, Applications Manual

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7 Application Instructions API 50-99
D V P - P L C A P P L I C AT I O N M A N U A L
7-101
API Mnemonic Operands Function
84 CCD P Check Code
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 * * * * * * *
D * * * * *
n * * *
CCD, CCDP: 7 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
: Start device for source data
D
: Device for storing the sum check result
n
: Number of data
Explanations:
1. Range of
n
: 1 ~ 256
2. See the specifications of each model for their range of use.
3. Flag: M1161 (8/16 bit mode switch)
4. The sum check is used for ensuring the correctness of the data transmission.
5. 16-bit conversion mode: When M1161 = Off, the instruction is in 16-bit conversion mode. The instruction sums
up
n
data (8 bits as a unit) from the start register designated in
S
and stores the results in the registers
designated in
D
. The parity bits are stored in
D
+ 1.
6. 8-bit conversion mode: When M1161 = On, the instruction is in 8-bit conversion mode. The instruction sums up
n
data (8 bits as a unit; only 8 low bits are valid) from the start register designated in
S
and stores the results in the
registers designated in
D
. The parity bits are stored in
D
+ 1.
Program Example 1:
1. M1161 = Off: The 16-bit conversion mode
2. When X0 = On, the instruction will sum up 6 data stored in the register designated in D0 (8 bits as a unit;
n
= 6
indicates D0 ~ D2 are designated) and store the result in the register designated in D100. The parity bits are
stored in D101.
X0
CCD D0 D100 K6
M1000
M1161