B&B Electronics ZZ24D-NA(NB,NC,ND)-SR - Manual - Manual (Page 24)

Hardware Information
18 Manual Documentation Number: pn7515_ZlinxIO-0712m
 4 Analog Inputs.
 RTD Temperature input module.
 4 Analog Outputs.
 2 Analog Inputs and 2 Analog Outputs.
Modules continue to be developed with additional features and options.
NOTE: Refer to “Appendix E: Zlinx Wireless I/O Models and Features” for a list of
available models and options.
3.3.2 I/O Types and Characteristics
3.3.2.1 Digital Inputs
DI’s can detect the presence of contact closures, transistor switches or on/off DC voltage signals (low or high logic levels).
Voltages below 0.8 VDC are interpreted as a low state. Voltages between 4.0 VDC and 48 VDC are interpreted as a high
state. The state of voltages between 0.8V and 4.0V are undefined.
In Peer-to-Peer mode the outputs are active because the Digital Inputs on the corresponding complimentary system are pulled
high. Connecting the Digital Inputs to a 10K pull down resistor would bring the DO’s low or inactive as a default.
NOTE: Inputs have an internal “weak” pull-up resistor so unconnected inputs will
read as being in the high state.
3.3.2.2 Digital Outputs
Digital Outputs send on/off signals (low or high logic levels) to drive external devices such as indicators, relay coils or the
inputs of other equipment such as PLC’s, SCADA, etc. Modules with Digital Outputs are available with sourcing or sinking
drivers and relay.
Sourcing (PNP transistor) drivers provide up to 40mA per output (or 320mA total for an 8 DO module) at output voltages up to
40 VDC to connected loads.
Sinking (NPN transistor) drivers can sink up to 40 mA per output (or 320mA total for an 8 DO module) at voltages up to 48
VDC.
3.3.2.3 Analog Inputs
Analog Inputs accept voltage, current signals, or RTD temperature signals. When configured as voltage inputs the full range is
0 to 10 VDC. When configured as current inputs the full range is 0 to 20mA and the input resistance is 250
Ω. When
configured as an RTD input, the range varies based on the RTD Probe. Supported Probe types include Pt100, Pt1000, Cu10.
NOTE: 0 to 20mA AI’s accommodate standard 4 to 20mA instrumentation current
loop signals.
3.3.2.4 Analog Outputs
Analog Outputs produce voltage or current output signals. When configured as voltage outputs the full range is 0 to 10 VDC at
1mA maximum. When configured as current outputs the full range is 0 to 20mA with a maximum load resistance of 450 Ω at
12V.
For all models except the ZZ-4AO-2, the 0-20mA output circuit is comprised of an open collector sinking output. This means
that an external supply will be required to properly setup the current loop. This type of circuit sinks the current to a common
ground, which will require the use of either a differential input type or an isolator in-between the output and input circuits.