Delta RMC151 - Manual (Page 663)

7 Hardware
Features
• One 5V RS-422 Quadrature input
• One high-speed registration input for registration or homing
Uses
• Encoder Reference Input
Reference inputs are often used as gearing or camming masters. Reference inputs
cannot be used for direct control of the input axis.
• Input for a Control Axis
The Q1 input can be used for the input of a control axis. The Control Output must be
from an axis module.
Specifications
Quadrature Interface
Inputs 5V differential (RS422) receiver, Quadrature A, B
Input Impedance 16 kΩ unterminated
249 Ω terminated (selectable by jumpers)
Max. Encoder Frequency 8,000,000 quadrature counts/second
Common Mode Input Range -10 V to +13.2 V
Absolute Max Voltage ±25 VDC. Applying greater than ±25 V will damage the receiver
chip and will require repair by Delta. Notice that the quadrature
input is not compatible with 24 V signals.
Daisy-Chaining Daisy-chain one encoder to a maximum of 32 Q1 modules
Reg Input
Input Characteristics 12-24 VDC, sinking or sourcing
Logic Polarity True High
Min Turn-On Voltage 5.75 V
Min Turn-On Current 1.25 mA
Max Turn-On Voltage 6.5 V
Max Turn-On Current 2.0 mA
Max Input Voltage 26.4 VDC
Max Input Current 2.6 mA at 24 V
Reg Input Response Time 40 µs
LEDs
Quad LED
This LED represents the input and control status for the axis. This bi-color (red/green)
LED has the following states:
State Description
Steady
Off
No power or this input is not assigned to an axis.
Steady
Green
The axis is either in closed loop control or is a reference axis. The axis is
not halted.
Flashing
Green
The input is in open loop and the axis is not halted (not possible for
reference axes).
Flashing A Closed Loop Halt or External Halt has occurred because an error bit is set
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