Rockwell Automation 1746-HSCE2 Multi-Channel High Speed Counter Module - Manual (Page 112)

Publication 1746-UM002B-EN-P - August 2004
6-20 Application Examples
Ladder File 8 Continued
Ladder File 9 - HSCE2 Initialization Routine
See the ladder logic from Example 2 on page 6-9.
0003
B3:0
4
PRESET_CHANGE_LATCH
0004 END
0002
B3:0
0
HSCE2_INIT_DONE
B3:0
2
SOFT_PRESET_TRGR
B3:0
OSR
3
PRESET_CHANGE_LATCH PRESET_CHANGE_LATCH
L
B3:0
4
L
B3:0
5
PRESET_ENABLE
JSR
Jump To Subroutine
SBR File Number
U:14
This rung triggers a dynamic change of the Counter 1 preset. The preset trigger bit (B3/2) sets the preset change latch bit (B3/4). The
preset change latch bit (B3/4) remains latched until the Counter Control Block is restored to the 1746-HSCE2 output image. Use B3/4 to
ensure that other logic (soft presets) do not write to the output image until the Counter Control Block is restored. The preset enable bit
(B3/5) allows the first handshake rung (ladder file 14, rung 0000) to run just once.
Jump to the preset change subroutine (ladder file 14) until the preset change handshaking is
complete (B3/4 is reset).