Allen-Bradley 1785 PLC-5 - Control Structure and Mnemonics

Addressing Reference
1785 PLC-5
16
T able F
Example Counter Addresses
To Address: PLC Data Type: Example Address:
Whole Counter Structure structure $C5:4
Counter Accumulated Word signed word $C5:7.ACC
Counter Preset Word signed word $C5:7.PRE
Counter Up Bit bit $C5:7.CU
Counter Down Bit bit $C5:7.CD
Counter Done Bit bit $C5:7.DN
Counter Overflow Bit bit $C5:7.OV
Counter Underflow Bit bit $C5:7.UN
T able G
Control Mnemonics
Mnemonic Structure Member Size PLC Data Type
.EN Enable 1 bit bit
.EU Enable Unloading 1 bit bit
.DN Done 1 bit bit
.EM Empty 1 bit bit
.ER Error 1 bit bit
.UL Unload 1 bit bit
.IN Inhibit Comparison 1 bit bit
.FD Found 1 bit bit
.UL Unload 1 bit bit
.IN Inhibit Comparisons 1 bit bit
.LEN Length 2 bytes signed word
.POS Position 2 bytes signed word
Figure 16
Control Structure
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
17376–I
EN EU DN Reserved
LEN – Length (–32,768 thru +32,767)
POS – Position (–32,768 thru +32,767)
EM ER UL FDIN