Sequencing Example 4, Dl430 - Automation Direct DL405 User Manual

16–22
F4–16DA–1 16-Ch. Analog Current Output
Sequencing
Example 4,
DL430
4 4 4
430 440 450
The following program example shows how to send digital values to the module
when you have more than one channel. This example also works for DL440 and
DL450 CPUs. It assumes you are using the following data locations.
V-Memory Locations for Output Data in Example 4
Channel Number 1
V–Memory Storage 3000
Channel Number 9
V–Memory Storage 3010
The channel index is stored in V1500. It varies from 0 to 7, pointing to pairs of
channels as shown: 0 = ch. 1 and 9, 1 = ch. 2 and 10, ... and 7 = ch. 8 and16. This
example assumes V1500 is initialized to "0" earlier in the program.
The first portion of the program updates one channel from the first bank of eight
channels (1 to 8) during each scan. The program comments for this portion also
show the accumulator status at each step. The second part of the program updates
one channel from the second bank of eight channels (9 to 16) during each scan
(accumulator status not shown, for brevity). So, there are two channels which are
updated on each scan. The last portion of the program increments the channel
index number and resets it after eight scans.
Channels 1 to 8
SP1
LD
V1500
Always On
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Acc.
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
SHFL
K12
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Acc. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
OUT
V1501
LD
V1500
2 3 4
3001 3002 3003
10 11 12
3011 3012 3013
This loads the number of the channel to be updated into the
accumulator. The channels are 1–8, but the values in V1500 range
from 0–7 and correspond to the channels. We'll use channel 2 as an
example.
0 0 0 0 0 0 0 0
Acc.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
This instruction moves the channel
selection bit(s) into the proper location.
We'll use it later when we send the 16-bit
data word to the module.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
Store the channel selection portion of the data word in V1501
temporarily. We'll have to use it again later.
Load the channel selection from V1500 once again.
0 0 0 0 0 0 0 0
Acc.
5 6 7
3004 3005 3006 3007
13 14 15
3014 3015 3016 3017
V1500
0 0 0 1
V1500 in accumulator.
V1500
0 0 0 1
8
16