Rockwell Automation 1771-TCM,D17716.5.108 TEMPERATURE CONTROL MOD - Manual (Page 29)

Chapter 3
Communicating with Your Module
3-7
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
I:001
35
8
O:002
Dest bit
Length
0
0
8
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
37
0
O:001
Dest bit
Length
9984
8
8
MEQ
MASKED EQUAL
Source
Mask
I:001
35
00FF
Compare 35
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
0
0
O:002
Dest bit
Length
0
0
8
This rung examines the low byte of TCM
module's input image word to see if it is equal
to 35
10
. If true, it copies the high byte of the
TCM module's input image word to the output
image byte of the module driving the heating
elements, and writes the value 37
10
to the
high byte of the TCM module's input image
word.
If the TCM module's watchdog timer bit is off,
this rung zeros the output image byte for the
outputs driving the heating elements.
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
I:001
37
8
O:003
Dest bit
Length
0
0
8
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
35
0
O:001
Dest bit
Length
9984
8
8
MEQ
MASKED EQUAL
Source
Mask
I:001
37
00FF
Compare 37
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
0
0
O:003
Dest bit
Length
0
0
8
This rung examines the low byte of TCM
module's input image word to see if it is equal
to 37
10
. If true, it copies the high byte of the
TCM module's input image word to the output
image byte of the module driving the heating
elements, and writes the value 35
10
to the
high byte of the TCM module's input image
word.
If the TCM module's watchdog timer bit is off,
this rung zeros the output image byte for the
outputs driving the cooling elements.
Since this instruction is designed primarily
for use with integer source and destination
words, the source bit and destination bit
must be designated in decimal. In these
cases you would enter 8
10
to designate bit
10
8
of the I/O image word
S:1
15
BTD
BIT FIELD DISTRIB
Source
Source bit
Dest
35
0
O:001
Dest bit
Length
9984
8
8
I:004
7
This rung examines status bit S:1/15, which
is on only during the first program scan, and
input image I:004/7, which reflects the state
of a bushbutton switch connected to that
input. If either is on, it writes the value 35
10
to the high byte of the TCM module's input
image word.
This bit is on during only the first program scan
This bit reflects the state of a pushbutton switch
used for manually starting the sequence
I:001
7
I:001
6
I:001
0
I:001
7
I:001
6
I:001
0