Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 196)

Application Example 2, Periodic Block
Transfer
Appendix C
CĆ12
rung 24* Ready bit 350/12 sets the enter bit 257/03.
rung 25 The LOAD/ENTER FAILED indicator 012/01 will be on
when the load/enter complete bit 353/12 is low.
rung 26* This rung resets the enter bit 257/03 when the ready bit
350/12 turns low.
rung 27 Bit 353/07 will go high upon loss of signal at analog input
1. This will energize 257/01 and set the analog output a
programmed value in word 2638 module word W05.
rung 28* This rung loads the location of the next data block
requested by the module (next block start address) into the
block transfer write instruction.
rung 29* If the power-up bit 350/13 is set, the get instruction fetches
the dynamic block start address stored in 0378. The put
instruction places the dynamic block start address in the
block transfer write instruction word 1318(1008 above the
data address). This rung will be true only until the first
load/enter sequence is executed. When true, it will
override rung 28.
rung 30 A 4-digit BCD value residing in data table location 1108
will be loaded into the setpoint word of the dynamic block
when pushbutton 111/01 is closed. This rung facilitates
user-entry of setpoint values.
NOTE: Although the get/put rung displays only the
values of the lower 12 bits in word 1108, it functionally
transfers all 16 bits into word 2648/
rung 31* The block transfer write instruction will write data from
the file location loaded into word 1318 to the module (the
location is determined by rungs 28 and 29). This
instruction is executed only when bit 050/01 is high (refer
to rung 11).