Rockwell Automation 1794-ID2/B INSTALL INSTR 24v FLEX I/O 2 CHANNEL Incremental Encoder Module - Manual (Page 14)

14 FLEX I/O 2-Channel Incremental Encoder Module
Publication 1794-IN063C-EN-E - February 2014
09…10 10 09 Gate Control Bits
0 0 No gate function on input G
0 1 Counting only if G is high (active)
1 0 Counting only if G is low (inactive)
1 1 The counter can be calibrated when G is high (active)
11…12 12 11 Store Control Bits - These bits will trigger a Store only if the
channel Store status bit (S0 or S1) are cleared (0).
0 0 Save counter value on positive edge of Z (if S0 or S1 = 0)
0 1 Save counter value on positive edge of G (if S0 or S1 = 0)
1 0 Save counter value on negative edge of G (if S0 or S1 = 0)
1 1 Save the counter value on the positive edge and negative edge of G
(if S0 or S1 = 0)
13 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 is FFFF hex = 65535
decimal
14 Store Reset bit - A positive edge on this bit resets the channel Store status bit (S0 or
S1).
15 Preset Reset bit - A positive edge on this bit resets the Preset Reached (PR0 or PR1).
Decription of Control Word 2
Bit Description
00 Filter A0 Enable bit - When this bit is set (1), and counter 0 is in mode 000 (Pulse
counting), signal A0 is filtered by a digital low pass filter with selectable constant.
01 Filter A1 Enable bit - When this bit is set (1), and counter 1 is in mode 000 (Pulse
counting), signal A1 is filtered by a digital low pass filter with selectable constant.
02…07 Reserved - set to 0
08…09 09 08 Filter Constant Bits - This constant is common to both counters
0 0 73.5 kHz or min 0.007 ms pulsewidth
0 1 37.8 kHz or min 0.013 ms pulsewidth
1 0 12.8 kHz or min 0.04 ms pulsewidth
1 1 1.2 kHz or min 0.4 ms pulsewidth
10…15 Reserved - set to 0
Description of Control Words 0 and 1
Bit Description