Rockwell Automation 1794-ID2/B INSTALL INSTR 24v FLEX I/O 2 CHANNEL Incremental Encoder Module User 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