1. No category

1st Question: Why and how to use I/O’s communication for SIWAREX U?
Answer :
Why use I/O communication:
Communication via IO area is fast, easy to program with small data volume but
complicated programming for large data volume.
Communication via SFC is easy to program for large data volume.
Attention: Simultaneous use of both communication types is not possible
How to use I/O communication:
SWAREX U occupies 16 bytes in the I/O area.
Eight bytes per channel are available for communication via the I/O area
WeighingChannel
1
Byte
0
Read read–identifier (n) for
DR(n) and DR(n+1)
1
2
3
4
Write write-identifier m for DR(m)
Not yet used
Job control
Value input(H) acc. w. identifier
m
Value input(L) acc. w. identifier m
5
6
7
2
S5 Output Area
Specified value 1(H)
(is transferred cyclically) to
remote display
Specified value 1(L)
(is transferred cyclically) to
remote display
8
Read read–identifier (n) for
DR(n) and DR(n+1)
9
10
11
12
Write write-identifier m for DR(m)
Not yet used
Job control
Value input(H) acc. w. identifier
m
Value input(L) acc. w. identifier m
13
14
15
Specified value 2(H)
(is transferred cyclically) to
remote display
Specified value 2(L)
(is transferred cyclically) to
remote display
S5 Input Area
Read read–identifier
acknowledgment n for DR(n) and
DR(n+1)
Status byte
Weight(H) (is updated cyclically)
Weight(L) (is updated cyclically)
Value output(H) in acc. w. identifier
n
Value output(L) in acc. w. identifier
n
Value output(H) in acc. w. identifier
n+1
Value output(L) in acc. w. identifier
n+1
Read read–identifier
acknowledgment n for DR(n) and
DR(n+1)
Status byte
Weight(H) (is updated cyclically)
Weight(L) (is updated cyclically)
Value output(H) in acc. w. identifier
n
Value output(L) in acc. w. identifier
n
Value output(H) in acc. w. identifier
n+1
Value output(L) in acc. w. identifier
n+1
The communication between PLC and Siwarex U is realized thru data records.
Overview of the Data Records:
DR No.
S5/S7data
records
(once
per
channel)
hex.
dec.
39
3A
3B
3C
3D
3E
3F
40
41
57
58
59
60
61
62
63
64
65
42
43
44
45
46
66
67
68
69
70
47
71
48
72
49
4A
4B
73
74
75
4C
4D
4E
4F
76
77
78
79
Function
Channel
Commands
Module number
Interfaceparameters
Agjustment digit 0
Adjustment digit 1
Adjustment weight
LED allocation
Zero setting value
Char. value of LC/
filter/ setting data
Limit value 1 on
Limit value 1 off
Limit value 2 on
Limit value 2 off
Specification value
1 for TTY
Specification value
2 for TTY
Remote display
type
Current digit value
Gross
Asynchronous
errors
Synchronous errors
Version
Checksum
Reserved
Length
Bytes
SFC/DS
Interfaces
E/
A
RS
232
EEPROM
X
X
X
X
X
X
2
2
2
2
2
2
2
2
2
-
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
X
X
X
X
-
2
2
2
2
2
-
I/O
I/O
I/O
I/O
I/O
-
3)
3)
3)
3)
No
-
2
-
I/O
-
No
-
2
-
I/O
-
Yes
X
X
X
2
2
2
-
O
O
O
-
No
No
No
X
-
2
2
2
2
-
O
O
O
O
-
No
No
No
No
1st Example Read the weight of channel 1
SIWAREX U starting at address 256
L PIW 258
T MW 100
// 256 +2
2nd Example Write the adjustment weight of channel 1
SIWAREX U starting at address 256
L PIB 257
T MB 200
//Read the status byte:
L
// DR for Adjustment weight (See chapter Commands & Messages)
62
T PQB 257
L 100
T PQW 260
AN M 200.7
=
M 10.7
L MB 10
T PQB 259
// Write-identifier for channel 1 is Byte 256 +1
// weight value
// Value input for channel 1 is Word 256 +4
// Bit 7 from Status byte
// change bit PQ 259.7 to activate the command
//State of the job (end) and errors should be checked in the status byte
3rd Example Set as Zero of channel 2
//SIWAREX U starting at address 256
L PIB 265
T MB 200
// Read the status byte:
L 57
T PQB 265
L 3
T PQW 268
AN M 200.7
= M 10.7
L MB 10
T PQB 267
//DR for Command
//Write identifier for channel 2 is byte 256 +9
//Command for Set as Zero (See chapter Setting to Zero)
//Value input for channel 2 is Word 256 +12
//State of the job (end) and errors should be checked in the status byte