Rockwell Automation 1771-IJ_IK IK ENCODER/COUNTER MODULES - Manual (Page 46)

6–2 Block Transfer Programming
Publication 1771ĆUM006B-EN-P - June 2002
Figure 6.1
Control Word Ć Block Transfer Mode
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17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
BIT
01
BIT
00
FUNCTION
Count. 0 0
0 1
1 0
1 1
Reset and hold the accumulated
count at 000.
Return the accumulated count to
000 and begin counting
immediately.
Invalid, module executes previously
programmed function.
Table Function Control Bits
Bits 00Ć01 Function
Control (See Table)
Bit 03, Up/down
1 = count up
0 = count down
(Significant in counter mode only)
Bit 02, Enable outputs
1 Ć Enable
0 Ć Disable
Bit 04, Home Latch Enable
1 Ć Enable
0 Ć Disable
Bits 05Ć17, Not used.
May have any setting
15960
Bit 04 is the home latch enable bit.
The module resets the count to zero when all three of the following
conditions are true:
•
Home latch enable bit (bit 04) is set to 1.
•
Marker input is high.
•
Home limit switch is closed (limit switch LED is on).
The count remains at zero until one or more of these conditions go
false. Then module operation follows the function control bits
described in Figure 6.1.