Yaskawa PLC-5 - Manual (Page 24)

GENERAL OPERATION
21 PAC Considerations
12/22/94- RD 3196-10
PAC tables dealing with setup function 115 are partially shown in FIgure 11.
The attributes of function blocks are summarized on sheet 11 of the PAC
diagram in the CDU table. The RDU table is usually also placed on sheet 1.
The RDU or PLC table size can easily be expanded as required, using the
"duplicate" command in the schematic editor. A single function number (a
single setup parameter) can be programmed to multiple RDUs and therefore
may appear in the RDU table several times. There would be no need for a
single function number to appear twice in a PLC table unless there are two
PLCs that wish to access a single function. Each PLC would require its own
gateway.
The RDU table and the PLC table can be compared as follows:
1. The RDU table node number selects the Remote Display
Controller PCB, which is usually between 100-110. The PLC table
node number selects the gateway node number, which is usually 200,
but could be 200-210.
2. A decimal location is independently assigned in each row.
The SCDU, PCDU, RDU, and PLC can each have different decimal
locations.
3. The PAC channel in the RDU table is entered once per function.
It selects one of several possible RDUs at that node. The PAC channel
in the PLC table is entered twice per function. It selects the PLC rack
number. The "PLC in" channel should always have a 1 in the hundreds
position. The "PLC out" channel should always have a 0 (or no digit)
in the hundreds column. The PLC BTW and BTR must be at group 0,
slot 0.
4. The PAC item number (subchannel) in the RDU table is entered
once per function. It selects the RDU menu number. In Figure 11,
function 115, "Master Line Speed", will appear as the 6th parameter on
the 5th RDU. The PAC channel in the PLC table is entered twice per
function. It selects the PLC BTW and BTR word number (0-63). The
PLC item (word) numbers for a single parameter should be kept
identical so that PLC block move operations can be easily done.
5. The description columns in both the PLC and RDU tables are
for reference only and do not change the drive code.