Inputs, Description, Inputs -2 description -2 – Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual User Manual
Page 188: Important, Attention
Publication 1797-6.5.6 - June 2005
41-2 1797-TB3S FLEX Ex Terminal Base Unit
Inputs
Do not apply any non-instrinsically safe signals to the terminal base.
The terminals in the terminal base unit may be electrically connected to each
other by the insertion of FLEX Ex I/O modules. See the module installation
instructions to determine this.
Description
The 1797-TB3S terminal base has 36 wiring connections to/from a plug-in
module. The use of each terminal depends on the module mounted in this
base.
The 1797-TB3S terminal base also has connections for cold junction
compensation and terminals designated for shield termination to chassis
ground.
The terminal base is equipped with a factory-installed tab cover for the
backplane bus connection. The tab cover may be removed only when the
terminal base unit is connected to other terminal base units.
IMPORTANT
When interconnecting several lines, you must consider the
total accumulated power and check for intrinsic safety
requirements.
ATTENTION
• Make certain that you power the terminal base unit with
an intrinsically safe power supply. Do not exceed the
values listed in the specifications for the terminal base
unit.
• Do not use the unused terminals on the terminal base
unit. Using these terminals as supporting terminals can
result in damage to modules and/or unintended
operation of your system.
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
39
40
41
42
43
44
45
46
Wiring Connections for Terminal Base 1797-TB3S
41254
Row A
Row B
Row C
Label placed at top of wiring area
Row A
Row B
Row C
+V -V
-V
+V
No connections allowed to terminals 36 and 49