Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 228)

13–13 PLC Addressing
Publication 1770Ć6.5.16 - October 1996
PLCĆ5 Memory (for use with figures on page 13-12 )
level 1 level 2 level 3 level 4
0 (data table) file number element number subĆelement number
Default files 0 - 999 timer/counter control
0 output 0 control 0 control
1 input 1 preset 1 length
2 status 2 accumulated 2 position
3 binary
4 timer PD ➀ BT
5 counter 0, 1 control 0 control
6 control 2 SP 1 RLEN
7 integer 4 Kp 2 DLEN
8 float 6 Ki 3 data file #
8 Kd 4 element #
9 - 999 user config 26 PV 5 rack/grp/slot
MG
0 control
1 error
2 RLEN
3 DLEN
➀ All PD values are floating point values, so they are two words long.
$ N 10 :
Displayed logical
Delimiter
File number
FileĆtype identifier
Element number
360
address symbol
PLC-5/250 Logical Binary Addressing
Byte Contents
1 mask byte
The LSB determines whether the module ID byte is specified or use the
default value, which is always 0; bits 1 through 7 are associated with levels
one through seven of a PLCĆ5/250 extended address.
You must always specify the last level of an address (even if it is a 0) so that
the actual number of levels in a particular address can be determined.
If a bit is set to 0, then a default value is assumed for the corresponding
address level. If a bit is set to 1, then you must specify a value for the
corresponding address level in the bytes which follow. Only those address
levels and the module ID byte with a 1 in the corresponding mask bit are
encoded. For example:
• 01111111 means that the module ID byte and 7 levels are specified.
• 00111010 means the module ID byte uses the default value. There are 7
levels in the address, and level 2 uses the default value (the default is
always 0).
This byte is required.
2 the module ID byte if there is a 1 in the LSB of the mask byte; otherwise, it
contains the first level of the address not using the default value
Memory Type Module ID Byte Value
System memory (RM) 0
Module memory (LP) (class x 10) + pushwheel number
where LP class = 3
I/O memory (RS) 1
This byte is required.
3 the first level of the address not using the default value if the module ID byte is
encoded. Otherwise, it contains the second level of the address not using the
default value.
4 the next level of the address not using the default value.
n up to 7 possible levels of addressing.