2
Publication 1794-IN102B-EN-P - June 2004
European Hazardous Location Approval
The following module is European Zone 2 approved: 1794-IA8K.
Installing Your ac Digital Input Module
The module mounts on a 1794 terminal base.
1.
Rotate the keyswitch (1) on the terminal base (2) clockwise to position
8
as required for this type of module.
2.
Make certain the flexbus connector (3) is pushed all the way to the left
to connect with the neighboring terminal base/adapter.
You cannot
install the module unless the connector is fully extended.
3.
Make sure the pins on the bottom of the module are straight so they
will align properly with the connector in the terminal base.
4.
Position the module (4) with its alignment bar (5) aligned with the
groove (6) on the terminal base.
5.
Press firmly and evenly to seat the module in the terminal base unit.
The module is seated when the latching mechanism (7) is locked into
the module.
Connecting Wiring for the 1794-IA8 and -IA8K
1. For 1794-TB2, -TB3, or -TB3S -
Connect individual input wiring to
even numbered terminals on the 0-15 row (A) as indicated in the table
below .
For 1794-TBN -
Connect individual input wiring to numbered
terminals on the 16-33 row (B) as indicated in the table below.
2. For 1794-TB2 -
Connect the associated 120V ac power lead (L1) of
the input device to the corresponding odd numbered terminals on the
0-15 row A for each input as indicated in the table below. (The odd
numbered terminals on row A are internally connected to 120V ac
L1.)
For 1794-TB3, or -TB3S -
Connect the associated 120V ac power
lead (L1) of the input device to the corresponding odd numbered
terminals on the 34-51 row (C) or to the corresponding terminal on
row (C) for each input as indicated in the table below. (The odd
numbered terminals on row (A) and the terminals of row (C) are
internally connected to 120V ac power L1.)
For 1794-TBN -
Connect the associated 120V ac power lead (L1) of
the input device to the corresponding odd numbered terminal on the
34-51 row (C) for each input as indicated in the table below. (The
120V ac power terminals of row (C) are internally connected
together.)
3.
Connect 120V ac power (L1) to terminal 34 on the 34-51 row (C).
4.
Connect 120V ac common (L2) to terminal 16 on the 16-33 row (B).
5.
If daisychaining power to the next terminal base, connect a jumper
from terminal 51 (+120V ac L1) on this base unit to terminal 34 on
the next base unit
6.
.If continuing ac common to the next base unit, connect a jumper
from terminal 33 (120V common L2) on this base unit to terminal 16
on the next base unit.
Wiring Connections for the 1794-IA8 and -IA8K
European Zone 2 Certification (The following applies when the product bears
the EEx Marking)
This equipment is intended for use in potentially explosive atmospheres as defined by
European Union Directive 94/9/EC.
The LCIE (Laboratoire Central des Industries Electriques) certifies that this
equipment has been found to comply with the Essential Health and Safety
Requirements relating to the design and construction of Category 3 equipment
intended for use in potentially explosive atmospheres, given in Annex II to this
Directive. The examination and test results are recorded in confidential report No. 28
682 010.
Compliance with the Essential Health and Safety Requirements has been assured by
compliance with EN 50021.
IMPORTANT
Observe the following additional Zone 2 certification requirements.
•
This equipment is not resistant to sunlight or other sources of UV
radiation.
•
The secondary of a current transformer shall not be open-circuited
when applied in Class I, Zone 2 environments.
•
Equipment of lesser Enclosure Type Rating must be installed in an
enclosure providing at least IP54 protection when applied in Class I,
Zone 2 environments.
•
This equipment shall be used within its specified ratings defined by
Allen-Bradley.
•
Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 40% when
applied in Class I, Zone 2 environments
ATTENTION
During mounting of all devices, be sure that all debris
(metal chips, wire strands, etc.) is kept from falling
into the module. Debris that falls into the module
could cause damage on power up.
WARNING
If you remove or insert the module while the backplane
power is on, an electrical arc can occur. This could cause an
explosion in hazardous location installations. Be sure that
power is removed or the area is nonhazardous before
proceeding..
1
2
3
4
5
6
7
Input
1794-TB2,-TB3, -TB3S
1794-TBN
Input
Terminal
120V ac
Supply
Input
Terminal
120V ac
Supply
Input 0
A-0
A-1
1
/C-35
B-0
C-1
2
Input 1
A-2
A-3
1
/C-36
B-2
C-3
2
Input 2
A-4
A-5
1
/C-37
B-4
C-5
2
Input 3
A-6
A-7
1
/C-38
B-6
C-7
2
Input 4
A-8
A-9
1
/C-39
B-8
C-9
2
Input 5
A-10
A-11
1
/C-40
B-10
C-11
2
Input 6
A-12
A-13
1
/C-41
B-12
C-13
2
Input 7
A-14
A-15
1
/C-42
B-14
C-15
2
A = Input terminals (Even numbered terminals
0 thru 14)
B = Common terminals
C = Power terminals (C-34 and C-51 on -TB2; C-34
thru C-51 on -TB3 and -TB3S)
B = Even numbered Input terminals
0-14, ac common terminals 16 and 33
C = Power terminals C-34 and C-51, and
odd numbered input terminals 1 thru 15
1 A-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TB2, -TB3 and -TB3S are internally connected in the
module to 120V ac L1.
2 C-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TBN are internally connected in the module to
120V ac L1.