Technical data
Publication 1794-2.1 - January 2000
136 24V dc 2 Input Frequency Module Cat. No. 1794-IJ2 FLEX I/O and FLEX Integra Product Data
Wiring
Simplified Schematic for DC to DC Converters (24V DC Power Supplies)
24V dc
isolated
dc/dc
converter
Channel 0
current limit
Channel 1
current limit
Frequency 0
Gate 0
Frequency 1
Gate 1
To customer devices
15mA
15mA
15mA
15mA
30mA
maximum
30mA
maximum
The frequency input module isolated power supply consists of 1 isolated
24V dc power supply that provides 2 current limited outputs of 30mA maximum
(1 for each channel).
40896
C-34
C-35
A-2 or
A-7
A-3 or
B-20
B-24
A-1 or
A-13
B-25
A-12 or
B-29
40625
Connections
or
1794-TB3G shown
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
3V 6V 24V
Pwr
RET 50
mV
Sel
500/50
mV
F24V
Pwr
24V
Pwr
F 500/50
mV
50
mV
Sel
RET 24V
Pwr
6V 3V
Out 0 Out 0
Ret
RET 50
mV
Sel
500/50
mV
G24V
Pwr
24V
Pwr
G 500/50
mV
50
mV
Sel
RET Out 1 Out 1
Ret
Chassis Gnd Chassis Gnd
Channel 0 Frequency Input Channel 1 Frequency Input
Channel 0 Gate Input Channel 1 Gate Input
+V COM Gnd 6 Chassis Ground
for Shields
Gnd
+V COM
24V dc
Supply In
24V dc
Supply Out
Channel 0 Output Supply Channel 1 Output Supply
Sply
0
Sply 0
Ret
Sply
1
Sply 1
Ret
All
24V
d
c pwr an
d
ret terminals are
sourced power
provided for the
sensors. Do not
connect external
power to these
terminals.
Provides power for
up to four 24V dc
devices at 15mA
each, for a total of
60mA. Channel 0
power and Channe
1 power have
current limiters,
each rated at 30m
A
max.
Row 1
Row 2
Row 3
A
B
C
ATTENTION
!
To reduce susceptibility to noise, power analog
modules and digital modules from separate
power supplies. Do not exceed a length of 10m
(33ft) for dc power cabling.
Do not daisy chain power or ground from the
RTD terminal base unit to any ac or dc digital
module terminal base units.
ATTENTION
!
Total current draw through the terminal base
unit is limited to 10A. Separate power
connections to the terminal base unit may be
necessary.