West Control Solutions 8700+ - Manual (Page 168)

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- DIN Controllers & Indicators - Product Manual
59305, Issue 7
– March 2014 Specifications Page 163
Auxiliary Inputs
Input Sampling rate: 4 per second
Input Resolution: 13 bits minimum
Input types: 4 to 20mA, 0 to 20mA, 0 to 10V, 2 to 10V, 0 to 5V, 1 to 5V.
The Full Auxiliary input in Option Slot B also supports 0 to 100mv
and Potentiometer (2KΩ or higher).
Measurement Accuracy
(reference conditions): 
0.25% of input span

1 LSD
Input resistance: Voltage ranges: 47K Ω nominal
Current ranges: 5 Ω
Input protection: Voltage input: will withstand up to 5x input voltage overload without
damage or degradation of performance in either polarity.
Current input: will withstand 5x input current overload in reverse
direction and up to 1A in the normal direction.
Isolation: Slot A has basic isolation from other inputs and outputs.
Slot B has reinforced isolation from other inputs and outputs.
Sensor Break Detection: For 4 to 20mA, 2 to 10V and 1 to 5V ranges only.
Digital Inputs
Type: Voltage-free or TTL-compatible
Voltage-Free Operation:
functions depend on model and how
configured Connection to contacts of external switch or relay:
Open = SP1, Automatic Mode or Local setpoint
selected.
Minimum contact resistance = 5KΩ,
Closed = SP2, Manual Mode, Remote Setpoint
selected, Latching Relay, Stored Min/Max/Time reset
(edge triggered) or Tare activate (edge triggered).
Maximum contact resistance = 50Ω.
TTL levels:
functions depend on model and how
configured 2.0 to 24VDC = SP1, Automatic Mode, Local Setpoint
selected.
–0.6 to 0.8VDC = SP2, Manual Mode, Remote Setpoint
selected, Latching Relay, Stored Min/Max/Time reset
(edge triggered) or Tare activate (edge triggered).
Maximum Input Delay (OFF-ON): 0.25 second.
Maximum Input Delay (ON-OFF): 0.25 second.
Isolation: Reinforced safety isolation from any source of
hazardous voltages.