Technical data

Publication 1794-2.1 - January 2000
FLEX I/O and FLEX Integra Product Data
24V dc 2 Channel Very High Speed Counter Module Cat. No. 1794-VHSC 141
Specifications - 1794-VHSC
Input Specifications
Module Location Cat. No. 1794-TB3G or -TB3GS Terminal Base Unit
Number of Inputs per Counter 2 groups of A/A
, B/B, and Z/Z pairs with 5V dc or
15-24V dc terminations
Input Voltage 5V dc or 15-24V dc (determined on terminal base
terminations)
Input Current (Typical) 5V dc terminations:
19.1mA @ 5V dc
25.7mA @ 6V dc
15-24V dc terminations:
6.1mA @ 15V dc
10.2mA @ 24V dc
Input Off-State Voltage 5V dc terminations: <
1.25V dc
15-24V dc terminations: <
1.8V dc
Input Off-State Current <
0.250mA
Input On-State Voltage 5V dc terminations: >
2.6V dc
15-24V dc terminations: >
12.5V dc
Input On-State Current >
5mA
On-State Voltage (max) 5V dc terminations: +
6V
15-24V dc terminations: Refer to derating curve
Input Frequency (max) 1.0MHz counter and encoder X1 (no filters)
500kHz encoder X2 (no filters)
250kHz encoder X4 (no filters)
Input Filter Selections 5: Off, 10µs, 100µs, 1.0ms, 10.0ms per A/B/Z group
Output Specifications
Number of Outputs 2 isolated groups of 2 (0.5A max @ 5V dc;
1.0A max @ 12-24V dc)
Output Control Outputs can be tied to 8 compare windows
Output Supply Voltage Range 5-7V dc; 10-31V dc
Off-State Leakage Current <
0.3mA
On-State Voltage Drop 5V operation - 0.5A
12-24V operation - 1.0A
On-State Current Maximum 5V operation - 0.5A
12-24V operation - 1.0A
Maximum Current per Output
Pair
5V operation - 0.9A
12-24V operation - 4.0A
Short Circuit Current 5V operation - 0.9V dc @ 0.5A
12-24V operation - 0.9V dc @ 1.0A
Outputs are short circuit protected and turned off
until power is cycled.
Delay Time
Off to On
On to Off
25µs (load dependent)
150µs (load dependent)
Isolation Voltage 100% tested @ 850V dc for 1s between six
isolated areas, including:
flexbus
module 24V dc power
A0/B0/Z0 inputs
A1/B1/Z1 inputs
O0/O1 and output power supply 1
O2/O3 and output power supply 2
Flexbus Current 75mA @ 5V dc (with terminal base power off)
Power Dissipation 5W maximum @ 31.2V dc
Thermal Dissipation Maximum 17.1 BTU/hr @ 31.2V dc
Indicators 1 green/red power/status indicator
6 yellow input status indicators - logic side
4 yellow output status - logic side
Keyswitch Position 1
General Specifications
Module Location Cat. No. 1794-TB3G or -TB3GS terminal base unit
Dimensions (HxWxD) 45.7mm x 94.0mm x 53.3mm
(1.8in x 3.7in x 2.1in)
External dc Power
1
Supply Voltage
Voltage Range
Supply Current
24V dc nominal
19.2 to 31.2V dc (includes 5% ac ripple)
100mA @ 24V dc
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Nonoperating
Vibration
0 to 55
o
C (32 to 131
o
F)
-40 to 85
o
C (-40 to 185
o
F)
5 to 95% noncondensing (operating)
5 to 80% noncondensing (non-operating)
30g peak acceleration, 11(±1)ms pulse width
50g peak acceleration, 11(±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
ConductorsWire Size
Category
12 gauge (4mm
2
) stranded maximum
3/64 inch (1.2mm) insulation maximum
2
2
Publications
Installation Instructions
User Manual
1794-5.67
1794-6.5.10
Agency Certification
1 Does not represent power required to supply the inputs or outputs.
2 Use this conductor category information for planning conductor routing. Refer to
publication 1770-4.1, “Industrial Wiring and Grounding Guidelines for Noise Immunity.”
Input Voltage
30
29
24
20
10
0
0 10202530 40505560
Input
Voltage
(V)
Ambient Temperature
o
C
The area within the curve represents the safe operating range for the module
under various conditions of user supplied 24V dc supply voltages and ambient
temperatures. This includes all possible mounting positions, including inverted
horizontal.
41702