Rockwell-automation 1771-QA Stepper Positioning Assembly User Manual Bedienungsanleitung PDF herunterladen (Seite 59)

3–37Programming and Operation

Publication 1771-UM002A–EN–P – May 2000

Table 3.B

Corresponding Handshake Bits

Moveset Control Word Moveset Control Word

Command Bit Function Bit

Start 00 Command verify 00

Reset 04

Reset 05

Stop 06

Programmed Stop and Command

Verify

Offset 13 Command Verify 00

Software jog reverse 14 Jog reverse and Command verify 14

Software jog forward 15 Jog forward and Command verify 15

Override 17 Command verify 00

MS Preset Word

Command Bit

Initialization preset 17

Command verify 00

Single Move Control Word

Command Bit

Load jog 03 Command verify 00

Once set, the reset and stop status bits remain set until another move begins.

Block Transfer Timing

The time required for a block transfer read or write operation for

PLC-2 Family processors depends on the system scan time(s), the

number of words to be transferred, the I/O configuration and the

number of enabled block transfer instructions in the ladder diagram

program during any program scan. A block transfer module will not

accept another transfer until finished processing the previous

transfer. For a worst case calculation of the time between block

transfers, assume that the number of enabled block transfer

instructions during any program scan is equal to the number of block

transfer modules in the system. Also assume that the stepper

controller module is operating in default mode so that 64 words or 10

words are transferred in the write or read operation, respectively.

The stepper controller module will toggle, when done, from one

operation to the other in the next program scan.

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Rockwell-automation 1771-QA Stepper Positioning Assembly User Manual Bedienungsanleitung Seite 59