Diagnostics – Rockwell Automation 1794-IB16D_OB16D Flex I/O 16 Input and 16 Output w/Diagnostics Module Installation Instructions User Manual
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Publication 1794-IN096B-EN-P - February 2004
6. 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
1794-TB2, -TB3, and -TB3S Terminal Base Wiring for the
1794-OB16D
Wiring Connections for the 1794-OB16D (use with 1794-TB2,
-TB3 or -TB3S terminal base units)
.
Diagnostics
(See configuration information below for location of diagnostic bits.)
Note: Each unused sensor port requires a dummy resistor to mask the
channel diagnostic function.
Diagnostic Functions for the 1794-IB16D)
Diagnostic Functions for the 1794-OB16D
Note: Each unused output port requires a dummy resistor to mask
the channel diagnostic function.
Outputs
Output Terminal
Common Terminal
Output 00
A-0
B-17
Output 01
A-1
B-18
Output 02
A-2
B-19
Output 03
A-3
B-20
Output 04
A-4
B-21
Output 05
A-5
B-22
Output 06
A-6
B-23
Output 07
A-7
B-24
Output 08
A-8
B-25
Output 09
A-9
B-26
Output 10
A-10
B-27
Output 11
A-11
B-28
Output 12
A-12
B-29
Output 13
A-13
B-30
Output 14
A-14
B-31
Output 15
A-15
B-32
+V dc
C-34 and C-51 (1794-TB2) (Power Terminals are internally connected in
the terminal base unit.
C-34 thru C-51 (1794-TB3, -TB3S) (Power terminals are internally
connected in the terminal base unit.
Common
B-16 thru B-33 (Common terminals are internally connected in the
terminal base unit.
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
Outputs
Commons
(1794-TB3 shown)
-V (Supply Common) = Terminals B-16 thru B-33
+V (Supply +Voltage In) = Terminals C-34 thru C-51
-V
Voltage
In +V
Voltage
Out +V
Voltage
A
B
C
(Use B-33 and C-51 for daisy-chaining to next terminal base unit)
Common
-V
Common
Terminals 35 thru 50 not available on 1794-TB2
Ext.
Power
Wiring
Input
Status
Channel
LED
Status
Open
Wire
Error Bit
Short
Error
Bit
Rev.
Error
Bit
Module
Error
Bit/LED
OFF
Open
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
Short
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
Normal
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
ON
Open
Off
RED
1
0
0
1/RED
On
RED/YEL
1
0
0
1/RED
Short
Off
RED
0
1
0
1/RED
On
RED/YEL
0
1
0
1/RED
Normal
Off
Off
0
0
0
0/OFF
On
YEL
0
0
0
0/OFF
REV
Open
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
Short
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
Normal
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
The module monitors each sensor-power port for current and voltage. It turns on the channel red LED and sets
(1) the error bit when 1) the module detects a short circuit (no voltage at the sensor-port), and 2) the module
detects an open wire ( no current at the sensor-port).
Ext.
Power
Wiring
Output
Status
Channel
LED
Status
Open
Wire Error
Bit
Short
Error
Bit
Rev.
Error
Bit
Module
Error
Bit/LED
OFF
Open
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
Short
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
Normal
Off
Off
0
0
0
0/OFF
On
Off
0
0
0
0/OFF
ON
Open
Off
RED
1
0
0
1/RED
On
YEL
0
0
0
0/OFF
Short
Off
Off
0
0
0
0/OFF
On
RED
0
1
0
1/RED
Normal
Off
Off
0
0
0
0/OFF
On
YEL
0
0
0
0/OFF
REV
Open
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
Short
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
Normal
Off
Off
0
0
1
1/RED
On
Off
0
0
1
1/RED
The module monitors each output channel. It turns on the channel red LED and sets (1) the error bit when 1)
the module detects a short circuit (the output signal is active at a channel and the corresponding output
voltage is low), and 2) the module detects an open wire (the output signal is inactive at a channel and the
corresponding output voltage is high).