Campbell CR6 Series, Руководство оператора

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Section 6. Specifications
110
Logic Level
5.0 Vdc
Logic High: > 3.5 V
Logic Low: < 1.5 V
3.3 Vdc
Logic High: > 2.0
Logic Low: < 0.8
6.1.4 Pulse Counting Function — Specifications
The CR6 can measure switch closure or high-frequency pulse signals on
C
and
U
terminals. Each terminal has its own 32-bit counter. Terminals are configured as
pairs with options for pull-up or pull-down. Even numbered U terminals can be
configured as low-level ac inputs.
Programmable Terminals — Pulse Counting Function
1
Terminal Label

============
Function

C1 C2 C3 C4 U1 U2 U3 U4 U5 U6 U7 U8 U9 U10 U11 U12
Switch closure
               
High frequency
               
Low-level Ac
1
     
1
When an even numbered U terminal is used for low-level Ac pulse counting, its odd numbered mate (e.g., U1 is the mate of U2 )
can be used only for switch-closure or high-frequency pulse counting or in the digital I/O control or state function.
Pulse Event
Transition from logic low to logic
high
Input Voltage Range ±20 Vdc
Maximum Counts Per Channel
2
: 2
32
Maximum Counts Per Scan:
2
32
Input Resistance: 5 kΩ
Detection Thresholds
5 Vdc logic
5 V Logic Level
Upper: 3.5 V
Lower: 1.5 V
3.3 V Logic Level
Upper: 2.0 V
Lower: 0.8 V