FLEX I/O 8 Relay Output Module
3
Publication 1794-IN019E-EN-P - May 2009
4.
If daisychaining power to the next terminal base, connect a jumper
from terminal 51 (+V DC) on this base unit to terminal 34 on the
next base unit.
5.
If continuing DC common to the next base unit, connect a jumper
from terminal 33 (common) on this base unit to terminal 16 on the
next base unit.
Wiring to a 1794-TBN or -TBNF Terminal Base Unit
1.
Connect individual output relay contact (customer load) to even
numbered terminals (0 thru 14) on row
(B)
and odd numbered
terminals (1 thru 15) on row
(C)
as indicated in the table below.
The even numbered terminals are one pole of the relay contacts;
the odd numbered terminals are the other pole of the relay
contacts.
2.
Connect 24V DC return to terminal 16 on the
16-33
row
(B)
.
3.
C24V DC power to terminal 34 on the
34-51
row
(C)
.
4.
If daisychaining power to the next terminal base, connect a jumper
from terminal 51 (+V DC) on this base unit to terminal 34 on the
next base unit.
5.
If continuing DC common to the next base unit, connect a jumper
from terminal 33 (common) on this base unit to terminal 16 on the
next base unit.
Wiring Connections for the 1794-OW8, 1794-OW8K, 1794-OW8XT
Image Table Memory Map
Installing or Changing a Fuse in the 1794-TBNF
This terminal base unit has fuse holders for 5X20mm fuses on each of the 8
even-numbered I/O terminals (0 thru 14 - row B). To install or change a
fuse:
1.
Press the fuse holder down toward the terminal strip.
2.
If replacing a fuse, remove the fuse from the fuse holder.
3.
Insert a known good 5X20mm fuse (Littelfuse pt. no. 239003, 3.0A,
250V AC slow-blow) into the fuse holder.
4.
Replace the fuse holder by rotating the fuse holder back to vertical
until it snaps into the locked position.
ATTENTION
Apply only 24V DC power to the power terminals on the terminal base unit.
Make certain that
all
relay wiring is properly connected before applying any
power to the module.
ATTENTION
When using 240V power to a relay, you must connect a snubber across the load.
Failure to connect a snubber across the load (relay contacts) can result in
generation of electromagnetic noise which could disrupt nearby electrical
equipment, including your 1794 FLEX I/O chassis. Use Allen-Bradley part number
599-KA04 or 1401-NX1.
ATTENTION
Apply only 24V DC power to the power terminals on the terminal base unit.
Make certain that
all
relay wiring is properly connected before applying any
power to the module.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
51
34
1794-TB2
0 –15
34–51
16–33
A
B
C
Output Relay Contacts (customer loads)
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
34
1794-TB3
0 –15
34–51
16–33
A
B
C
Output Relay Contacts (customer loads)
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
18
19 20
21
22
23
33
24
25
26
27 28
29 30
31 32
17
35 36
37 38
47
48
49
50
34
51
16
Label placed at top of wiring area.
Row A
Row B
Row C
Row A
Row B
Row C
39
40
41 42
43
44
45 46
1794-TB3S
Output
Channel
1794-TB2, -TB3, -TB3S
1794-TBN, -TBNF
Output Terminal
Output Terminal
0
A-0
B-0
A-1
C-1
1
A-2
B-2
A-3
C-3
2
A-4
B-4
A-5
C-5
3
A-6
B-6
A-7
C-7
4
A-8
B-8
A-9
C-9
5
A-10
B-10
A-11
C-11
6
A-12
B-12
A-13
C-13
7
A-14
B-14
A-15
C-15
A-(even) = one contact of the relay
A-(odd) = the other contact of the relay
B-(even) = one contact of the relay
C-(odd) = the other contact of the relay
+24VDC
C-34 thru C-51 (-TB3, -TB3S) C-34 and
C-51 (-TB2)
C-34 and C- 51
-24V DC (RET)
B- 16 thru B-33
B-16 and B-33
Dec.
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Oct.
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Read
Word
Not used - reserved
Write
Word
Not used - set to 0
O7
O6
O5
O4
O3
O2
O1
O0
Where: O = Output number (O0 corresponds to output 0, O1 corresponds to output 1, and so on)
When bit = 0, output 0 is off, when bit 0 1, output 0 is on.
0
2
4
6
8
10
12
14
33
16
1
3
5
7
9
11
13
15
51
34
16, 0, 2, 4, 6,
8, 10, 12, 14, 33
34, 1, 3, 5, 7,
9, 1 1, 13, 15, 51
C
B
1794-TBN, -TBNF
16
33
Even Numbered T erminals 0 thru 14
34
51
Odd Numbered T erminals 1 thru 15
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