Allen-Bradley 1785 PLC-5 User Manual

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
T able 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
DAT A[0] thru DA T A[51] Reserved / Internal Use (52 X 2 bytes)
NR TO EN ST DN ER CO EW
T able 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

Allen-Bradley 1785 PLC-5 Specifications

General

Manufacturer	Allen-Bradley
Memory Size	Up to 64K words
Programming Language	Ladder Logic
Series	PLC-5
Communication Ports	DH+