User manual

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
110011111110 1100 01
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 offset
Device-Type Register
011111111110 1000 03
Status/Control Register
GRE 1 1 SYSF 1 NOCV 1 1 SRIE RELM MYAS 1 RDY PASS NOSF RSTP 05
Offset Register
11111111 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
CF E C
7F 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