Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 186)

18Ć4
Except for the drop depth register (register 20) in the slave modules,
registers 0Ć31 in the drop 0 area are written to by the onĆboard CPU.
Therefore the application task has Read Only access to these
registers.
Registers 32Ć39 in the drop 0 area are broadcast registers. These
registers are controlled by an application task running in a
Processor module in the master rack. These registers are
Read/Write in the master and Read Only everywhere else on the
network.
The registers in the drop 0 area are defined as follows:
Register Description
0 Reserved For System Use
1 Reserved For System Use
2 Reserved For System Use
3 Reserved For System Use
4 Drop 0Ć15 Status in Bits 0Ć15
5 Drop 16Ć31 Status in Bits 0Ć15
6 Drop 32Ć47 Status in Bits 0Ć15
7 Drop 48Ć55 Status in Bits 0Ć15
8 Reserved For System Use
9 Reserved For System Use
10 Reserved For System Use
11 Reserved For System Use
12 Drop Number
13 (Reserved For System Use
14 Messages Received
15 Receive Timeouts
16 CRC Errors
17 Overrun Errors
18 Abort Errors
19 Messages Transmitted
20 Drop Depth
21 Reserved For System Use
.. ăăăă..
31 Reserved For System Use
32 Broadcast Data
33 Broadcast Data
34 Broadcast Data
35 Broadcast Data
36 Broadcast Data
37 Broadcast Data
38 Broadcast Data
39 Broadcast Data
40 Reserved For System Use
.. ăăăă..
63 Reserved For System Use
Figure 18.1 Ć Register Assignment for Drop 0 Area
Note that some of the registers reserved for system use are not
protected against being written to by an application task. You must
ensure that drop 0 areas are not written to (with the exception of
register 20 in the slave modules).