Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 64)

4Ć2
Register Description
0Ć3 Not used
4 Status of drop 1Ć7 in bits 1Ć7
5Ć11 Not used
12 Drop number
13 Program mode (keyswitch position 1 = memory
protect, 2 = setup, 3 = program)
14 Messages received
15 Receive timeouts
16 CRC/parity errors
17 Overrun errors
18 Abort errors
19 Messages transmitted
20Ć511 Not used
Figure 4.1 Ć Drop 0 Status Register Assignments
4.3 Data Access
Multibus, Shark, and Remote Head input registers are Read Only.
Multibus, Shark, and Remote Head output registers are Read/Write.
Registers in dual port memory will acknowledge Multibus accesses
just like the module does in the slave drop. A register on a particular
module in a slave drop that is Read Only will be Read Only in the
master drop dual port memory. A bus error will occur if a register in
the master dual port memory is referenced and that register does not
exist in the slave Multibus, Shark, or Remote Head drop.
Registers 0 through 7 on a Shark I/O module are always reserved for
input data. Registers 8 through 15 are always reserved for output
data. Registers 16 through 32 are not accessible. Note that in the
case of a digital module in a mixed (both digital and analog modules)
Shark rack, a bus error will NOT be reported if an invalid register is
referenced. An invalid register may be a register that is not valid for
the particular module in the slot, or that is not valid for Shark modules
at all, i.e., 16 through 32. See Appendix I for a listing of the individual
Shark module memory maps.
Registers 0Ć3 on an M/N 57C328 Remote I/O Head are always
reserved for input data, and registers 4Ć7 are always reserved for
output data. These registers are divided into four input/output pairs.
Each pair is reserved for a Rail; therefore, you can mix input and
output modules in a Rail. Registers 8Ć31 on an M/N 57C328 Remote
I/O Head are not accessible. Refer to Appendix I for more
information.
Registers 0 and 1 on a Remote Drive Interface Head are always
AutoMax outputs (information to the drive) and registers 2 and 3 are
always AutoMax inputs (information from the drive). See appendix I
for a memory map of the Remote Drive Interface Head.
NonĆReliance Multibus I/O modules (modules not manufactured by
Reliance Electric) that are Write Only will be Read/Write in the master
drop dual port memory. NonĆReliance modules used in slave drops
are subject to the following limitations:
D The module base address must begin on a 64K boundary.