Chapter 4 – Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual User Manual
Page 60
Chapter 4
Ladder-Program Interfaces
4-13
Table 4.C
Fields for the Physical Structure of the VME Status File
Word
Code
Function
Explanation
6
2
FEN
From-VME enabled
If 1, the continuous-copy-from-VME operation is enabled (active when in run mode).
6
2
FAM
From-VME
address modifier
If 0, the continuous-copy-from-VME operation uses the 2D VMEbus address modifier (A16); if 1, it
uses 3D (A24).
6
2
FDS
From-VME data size
If 0, the continuous-copy-from-VME operation does D16 VMEbus transfers; if 1, it does D08(EO)
transfers.
6
2
FERROR
From-VME error code
If nonzero, refer to page 11 for the most-recent error.
8
2
FADDRESS (HI BYTE) Meaningful only if TAM=1
Address bits 23-16 of the address of the first byte of the VMEbus source.
9
2
FADDRESS
VMEbus source
Address bits 15-0 of the address of the first byte of the VMEbus source.
10
2
FLENGTH
From-VME copy length
The number of 16-bit words to be transferred by the continuous-copy-from-VME operation.
11
2
FFILE
From-VME file number
The number of the processor destination file of the continuous-copy-from-VME operation.
12
2
FELEMENT
From-VME
element number
The number of the first element to be transferred in the destination file of the continuous-copy-
from-VME operation.
13
2
FINT
From-VME interrupt
If nonzero, the VMEbus interrupt level of the interrupt to be generated after completion of each
continuous-copy-from-VME operation.
000 specifies no interrupt,
001 specifies interrupt level 1,
010 specifies level 2,
...,
111 specifies level 7.
14
2
FSTATUSID
From-VME status/ID
The VMEbus status/ID value transmitted during interrupt-acknowledge cycles of the
above interrupt.
15
2
TEN
To-VME enabled
If 1, the continuous-copy-to-VME operation is enabled (active when in run mode).
15
2
TAM
To-VME address modifier
If 0, the continuous-copy-to-VME operation uses the 2D VMEbus address modifier (A16);
if 1, it uses 3D (A24).
2
Both PLC ladder logic and the VME host computer can write to the status file fields that control the continuous-copy-from function. When both the ladder program and the host computer try to update the
status file simultaneously, the ladder program overwrites the changes made by the host.