Input type selection, Input type selection -2 – Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module User Manual
Page 20
Publication 1746-UM006B-EN-P - August 2005
2-2 Module Operation
The above sources are determined by the Operating Mode and the
Output Source Select fields.
Module operation is determined by user-defined configuration
parameters. Setting the Function Control bit to 1 starts the proper
pulse counter, Rate Measurement, and output control functions.
Dynamic parameters can be changed regardless of the Function
Control bit. Static Parameters can be changed only when the Function
Control bit is reset (to 0).
Input Type Selection
The type of input you require for your application is selected by
means of three bits located in the Setup and Control Word (M0:e.1).
The table below indicates how the bits must be set to configure
quadrature encoder, pulse and direction, or up/down pulse inputs.
Input Type - bits 9, 10, 11
The input type you select determines how the A and B inputs cause
the module’s counter to increment and decrement. For all three input
types, the Z input can be used to force a counter reset. The A, B, and
Z inputs operate with input signals up to a maximum rate of 50k Hz.
Setup and Control
Word Bits
Input Type
11
10
9
0
0
0
Invalid - configuration error
0
0
1
Invalid - configuration error
0
1
0
Pulse and Direction w/External Control
0
1
1
Pulse and Direction w/Internal Control
1
0
0
Quadrature Encoder Input - X1
1
0
1
Quadrature Encoder Input - X2
1
1
0
Quadrature Encoder Input - X4
1
1
1
Up/Down Pulse Inputs
Setup and Control Word, Word 1
Bit Number (decimal)
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Input Type
M0:e.1