SDM-IO16A 16-Channel Input/Output Module

The SDM-IO16A has 16 ports that expand the digital input and/or output capability of Campbell Scientific data loggers. This module offers similar functionality to the control ports of the majority of

  • Product Name:16-Channel Input/Output Module
  • Model:SDM-IO16A
  • Maunufactor:Campbell Scientific
  • Country:USA

The SDM-IO16A has 16 ports that expand the digital input and/or output capability of Campbell Scientific data loggers. This module offers similar functionality to the control ports of the majority of Campbell Scientific data loggers.


The SDM-IO16A was designed to replace the SDM-IO16. The SDM-IO16A is more compact in comparison and has gas-discharge tubes fitted on all inputs for improved surge protection. It is fully software-compatible but also includes an option to run in a special high-speed mode that allows pulse measurements up to 8 kHz on all channels and four times more resolution on some timing measurements.


Benefits and Features

  • 16 digital I/O ports

  • When configured as an input, each port can monitor logic state, count pulses, measure signal frequency, and determine duty cycle

  • Consumes less than 1 mA power in most applications

  • Compact package with spring-loaded, vibration-resistant terminals

  • Connects to the data logger via three ports that can be shared with up to 15 other SDM devices

  • Multiple different functions for programming each input and different function assignments for different ports on the same module

  • Capability of each terminal to directly drive low-voltage valves or relays

  • I/O lines protected against high-level surges with gas discharge tubes

Function:     Expands the digital input and/or output capability of a data logger.

Operating Temperature:     -40° to +70°C

Number of Channels:     16

SDM and I/O Port:     0/5 V logic-level ports (for connecting to the data logger’s control/SDM ports)

EMC Status:     Complies with EN 61326:2013

Operating Voltage:     12 Vdc (nominal 9 to 18 V)

Minimum Frequency:     0 Hz is reported if there are less than two high-to-low signal transitions in the measurement interval.

Minimum Pulse Width:     244 μs (61.04 μs in high-speed mode)

Default Switch Debounce Timing:     Input and ground must remain closed for 3.17 ms then remain open for 3.17 ms to be counted as a closure. (0.7925 ms in high-speed mode)

Internal Clock Accuracy:     ±0.01%, worst case (-40° to +70°C)

Maximum Pulse Measurement Interval:     4096 seconds (1024 seconds in high-speed mode)

Dimensions:     188 x 64 x 22 mm (7.4 x 2.5 x 0.9 in)

Weight:     175 g (6.2 oz)


Current Drain

NOTE:     Current consumption is roughly proportional to input-signal frequency and number of ports used. Current drawn from any output must be added to the quiescent level to obtain the total current drain.

Typical Standby:     600 µA (all ports high, no load, excludes pulse counting)

Maximum:     

  • 3 mA (active with all 16 ports counting pulses at 2 kHz and no output load)

  • 4.5 mA (in high-speed mode, counting up to 8 kHz)


Maximum Frequency (with 50/50 duty cycle)

Switch Debounce-Mode Turned Off:     2.0 kHz on all channels simultaneously (8.0 kHz in high-speed mode)

Default Switch Debounce-Mode Enabled:     150 Hz on all channels


Output

NOTE: For information regarding the output current at other voltages, refer to the product manual.

ON/HI Voltage (no load):

  • 5 V (nominal)

  • 4.5 V (minimum)

OFF/LO Voltage (no load):

  • 0 V (nominal)

  • 0.1 V (maximum)

Sink Current:     Output will sink 8.6 mA from a 5 V source.

Source Current:

  • 42 mA (@ 3 V)

  • 133 mA short-circuited to ground

Input

Voltage:

  • 4.0 V minimum threshold (high)

  • 1.0 V maximum threshold (low)

Protection:     Input clamped at -0.6 V and +5.6 V relative to ground (via a 33 Ω resistor to withstand a continuous current flow of 200 mA)

Impedance:     Biased to +5 V relative to ground (by a 100 kohm resistor)