Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 185)

18Ć3
Table 18.4 Ć Discovering the Ending Module Group for a Rack
When this value is contained
within a rack's Ending
Mod(ule) Group register:
It means the last
I/O group is:
And the rack size is:
0 1 1/4 rack (2 words)
1 3 1/2 rack (4 words)
2 5 3/4 rack (6 words)
3 7 full rack (8 words)
For a list of the status register and error counter registers associated
with each rack, see Appendix D, Register Assignment Map."
18.3 Overview of the DCSĆNET Interface
Register Organization
The DCSĆNET network interface is divided into 56 areas, or drops,
each containing 64 16Ćbit registers (a total of 3584 registers). Refer
to table 18.5 for register assignment.
Table 18.5 Ć DCSĆNET Network Register Assignment
DROP AREA REGISTER TYPE MASTER SLAVE
0 0Ć31
32Ć39
Status
Broadcast
NOT TRANSMITTED
Transmits ăăReceives
1 0Ć31
32Ć63
Data Exchange
Data Exchange
Receives
Transmits
*
*
2 0Ć31
32Ć63
Data Exchange
Data Exchange
Receives
Transmits
*
*
.
.
.
.
.
.
ąąą.
ąąą.
ąąą.
.
.
.
.
.
.
53 0Ć31
32Ć63
Data Exchange
Data Exchange
Receives
Transmits
*
*
54 0Ć31
32Ć63
Data Exchange
Data Exchange
Receives
Transmits
*
*
55 0Ć31
32Ć63
Data Exchange
Data Exchange
Receives
Transmits
*
*
*Slaves transmit registers 0Ć31 from only the drop areas they represent. All
other registers receive data only.
Memory areas are written to by either the card's onĆboard CPU or by
an application task running on a Processor module in the rack.
Memory areas that are written to by the onĆboard CPU cannot be
written to by an application task and vice versa. All memory areas,
however, can be read by both the onĆboard CPU and application
tasks.
18.3.1 Using the Registers in the Drop 0 Area
Registers 0Ć31 contain network status and control information. This
information is unique and is not transmitted over the network.