SDM-IO16

Name: SDM-IO16
Brand: Campbell Scientific
SKU: 16502
Availability: Discontinued

16-Channel Input/Output Module

SDM-IO16

Retired

16-Channel Input/Output Module

No longer available to order

This product is retained for service, documentation, and compatibility information.

Replaced by

SDM-IO16A
16-Channel Input/Output Module

Model:: SDM-IO16
Item Number:: 16502
Warranty:: 1 year

Overview

The SDM-IO16 expands the digital input and output channel count of Campbell Scientific data loggers.

Key Advantages

Expands Data Logger Digital Input/Output Capability

Technical Description

The SDM-IO16 expands the digital input and/or output capability of Campbell Scientific data loggers. When a port is configured as an input, each port can monitor logic state, count pulses, measure signal frequency, and determine duty cycle. An option in the pulse counting mode enables switch debounce filtering, allowing the SDM-IO16 to accurately count switch closures. The SDM-IO16 can also be programmed to send an interrupt signal to the data logger when one or more input signals change state.

When configured as an output, each port can be set to 0 or 5 V by the data logger. A boost circuit allows an output that is set HI to source a current of up to 100 mA (at a reduced output voltage) for controlling external devices such as low voltage valves or relays.

Up to 15 SDM-IO16 modules can be addressed allowing up to 240 ports to be controlled by the data logger.

Data Logger Connection

The SDM Jumper Wire Kit (pn 32505) connects up to four SDMs to the data logger. This kit is recommended when multiple SDMs are connected to one data logger or for extremely short distances between the SDM and data logger. The CABLE5CBL-L cable is recommended for connecting a single SDM to the data logger, and for longer distances between the SDM and data logger.

Benefits

Provides 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

Specifications

Function: Expands the digital input and/or output capability of a data logger.
Number of Channels: 16
Operating Temperature: -25° to +50°C
SDM & I/O Port: 0/5 V logic level ports
(for connecting to the datal ogger’s control/SDM ports)
EMC Status: Complies with EN 61326:1997.
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
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.
Internal Clock Accuracy: ±0.01%, worst case
(-25° to +50°C)
Maximum Pulse Measurement Interval: 15.9375 s
Dimensions: 23.0 x 10.0 x 2.4 cm
(9 x 4 x 1 in.)
Weight: 350 g
(12 oz)

Maximum Frequency (with 50/50 duty cycle)

Switch Debounce-Mode Turned Off: 2.0 kHz on all channels simultaneously
Default Switch Debounce-Mode Enabled: 150 Hz on all channels

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

Output

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)
Source Current: Output will source 42 mA at 3 V.
133 mA short-circuited to ground
Impedance: Biased to +5 V relative to ground
(by a 100 kohm resistor)

Accessories

(2)

Common Accessories

(2)

Replacement Parts

(2)

Ships With

(2)

Similar Products

(4)

Compatibility

Software Requirements

Support for all the functions requires CRBasic’s SDMIO16 instruction or Edlog’s Instruction 188. Instruction 188 is available in Edlog templates that post date March 2002. (LoggerNet version 2.1 contains this template.) Edlog templates that predate March 2002 can support only the output mode using Instruction 104. The SDMCD16AC instruction supports only the output mode in CRBasic.

Power Considerations

In input mode, the power consumption varies from 3 to 600 microamps depending on the mode and input frequencies. The data logger's rechargeable power supply can often power the SDM-IO16 in these pulse counting or status input applications.

However, when the SDM-IO16 is used in an output mode and is driving significant loads, an external power supply is recommended.

Enclosure Considerations

The SDM-IO16 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. An integral mounting bracket, grommets, and screws attach the SDM-IO16 to the backplate of a Campbell Scientific enclosure.

Sensor Cabling

This cabling is typically sold as a part of the sensors. If cabling is not provided, you can use our 9922 two-conductor cable (see Ordering Info). When the distance between the data logger and the SDM-IO16 are significant, verify that the sensor cable has adequate resistance/capacitance specifications. Also, avoid sensors with completion resistors in their pigtails; it's preferable to have the completion resistors at the data logger.