Addressing Reference
1785 PLC-5
15
Table D
Example Timer Addresses
To Address:
PLC Data Type:
Example Address:
Whole Timer Structure
structure
$T4:5
Timer Accumulated Word
signed word
$T4:3.ACC
Timer Preset Word
signed word
$T4:3.PRE
Timer Enabled Bit
bit
$T4:3.TE
Timer Timing Bit
bit
$T4:3.TT
Timer Done Bit
bit
$T4:3.TD
Table E
Counter Mnemonics
Mnemonic
Structure Member
Size
PLC Data Type
.CU
Up Enable
1 bit
bit
.CD
Down Enable
1 bit
bit
.DN
Done
1 bit
bit
.OV
Overflow
1 bit
bit
.UN
Underflow
1 bit
bit
.PRE
Preset Value
2 bytes
signed word
.ACC
Accumulated Value
2 bytes
signed word
Figure 15
Counter Structure
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
17375–I
CU
CD
DN
Reserved
PRE – Preset Value (–32,768 thru +32,767)
ACC – Accumulated Value (–32,768 thru +32,767)
OV UN