Addressing Reference
1785 PLC-5
23
Word:
Range:
Term:
Contains:
14
Scaled PV value (displayed)
S
min
thru S
max
15
Scaled error value (displayed)
S
min
thru S
max
16
Output (% of 4095)
CV
0 thru 100%
17 – 22
internal storage; do not use
Table R
Message control Mnemonics in MG File
Mnemonic
Structure Member
Size
PLC Data Type
.NR
No Response
1 bit
bit
.TO
Time Out
1 bit
bit
.EN
Enable
1 bit
bit
.ST
Start Transmission
1 bit
bit
.DN
Done
1 bit
bit
.ER
Error
1 bit
bit
.CO
Continuous
1 bit
bit
.EW
Enabled Waiting
1 bit
bit
.ERR
Error Code
2 Bytes
signed word
.RLEN
Request Length
2 Bytes
signed word
.DLEN
Done Length
2 Bytes
signed word
.DATA[0] thru
.DATA[51]
Reserved / Internal Use
52 X 2 Bytes
signed word
Figure 21
Message Control Structure in MG File
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ERR Error Code
RLEN Requested Length
DLEN Done Length
DATA[0] thru DATA[51] Reserved / Internal Use (52 X 2 bytes)
NR TO
EN
ST DN
ER CO EW
Table S
Example Message Control Addresses
To Address:
PLC Data Type:
Example Address:
Whole Message Control
Structure
structure
$MG14:0
Request Length
signed word
$MG14:0.RLEN
Done bit
bit
$MG14:0.DN