Configuration registers – Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual User Manual
Page 42
Chapter 3
VMEbus Interface
3-4
The configuration registers are a standard way of identifying, configuring,
controlling, and monitoring the PLC-5/VME processor as a VMEbus
device. They are mapped into the VMEbus A16 address space at a
location defined by switches 1-3 of SW2. For example, if these three
switches are set to ON, the first register (the ID register) is at address
FC00 (hex).
The registers are shown in Figure 3.1 and described individually thereafter.
Figure 3.1
The Eight Configuration Registers
ID Register
1
1
0
0
1
1
1
1
1
1
1
0
1
1
0
0
01
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
offset
Device-Type Register
0
1
1
1
1
1
1
1
1
1
1
0
1
0
0
0
03
Status/Control Register
GRE
1
1
SYSF
1
NOCV
1
1
SRIE
RELM MYAS
1
RDY
PASS NOSF RSTP
05
Offset Register
1
1
1
1
1
1
1
1
07
Command Control Register
WRDY LOCK
ERR
1
COPY-TO-STATE COPY-FR-STATE
ERROR CODE
09
Command Control and Lock Register
0B
Command High Register
0D
Command Low Register
0F
SLAVE BASE
WRDY LOCK
ERR
1
COPY-TO-STATE COPY-FR-STATE
ERROR CODE
C
F
E
C
7
F
E
8
00
offset
02
04
06
08
0A
0C
0E
Important: The system repeats these registers eight times; you can use
only the first eight registers as the configuration register.
These registers are described in detail below. Where a bit position has
been described as a 0 or 1, the bit is a read-only bit and writing to it has
no effect.
Configuration Registers