Allen-Bradley FLEX I/O 1794-ID2, User Manual, Page: 48 / 84

4–6 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Publication 1794-6.5.15 – December 1998
Definition
Bit Write
Word
Write
Word 0
continue
Bits 11–12
(13–14)
12 11 Store Control bits – These bits will trigger a Store only if the channel Store status bit (L0 or L1) is
cleared (0).
Wor 0
continued
13–14
0 0 Save the counter value on the positive edge of Z (if Stored X = 0)
0 1 Save the counter value on the positive edge of G (if Stored X = 0)
1 0 Save the counter value on the negative edge of G (if Stored X = 0)
1 1 Save the counter value on the positive edge and negative edge of G (if Stored X = 0)
Bit 13 (15) Rollover bit – When set (1), the counter counts up to the preset and then restarts at 0. If this bit is reset (0) (not
rollover), the rollover preset value = FFFF (hex = 65535 (decimal).
Bit 14 (16) Store Reset bit – A positive edge on this bit resets Store X in Signals.
Bit 15 (17) Preset Reset bit – A positive edge on this bit resets Preset Reached in Signals.
Write
Wor 1
Channel 1 Control Word – Control word for setting the function of counter 1.
Word 1
Bits 00–02 02 01 00 Mode Selection bits
0 0 0 Counting on positive (rising) edge of input signal A. (Up/dwn counting determined by B.)
0 0 1 Quadrature encoder X1
0 1 0 Quadrature encoder X2
0 1 1 Quadrature encoder X4
1 0 0 Counting up on the positive edge of input signal A, and down on positive edge of input signal B.
1 0 1 No count function.
1 1 0 No count function.
1 1 1 No count function.
Bit 03 Preset bit – A positive edge on this bit moves the value in Preset X to Counter X, independent of Preset Enable.
Bit 04 Preset Enable bit – When this bit is set (1), a positive edge on Z preloads Counter X = Preset X, independent of
Cal Enable.
Bit 05 Count Enable bit – When this is set (1), the incremental encoder is counting.