Yaskawa 545 PLC - Manual (Page 6)

3 SOFTWARE
5 SOFTWARE
4/12/94
SOFTWARE The EPROMs on the CPU card contain a software program that is fixed (i.e.
not changeable on a job-to-job basis), and is transparent to the user. The
software allows bi-directional communication between MicroTrac DSD drives
and the Texas Instruments series 545 PLCs as follows:
Logics
1. PAC block LOGI, inputs from the PLC discrete output modules.
2. PAC block LOGO, outputs to the PLC discrete input modules.
Numerics
1. PAC block NUMI, inputs from the PLC register output modules.
2. PAC block NUMO, outputs to the PLC register input modules.
The PLC gateway provides a means of moving data between the nodes on the
MicroTrac LAN and the Texas Instruments PLC. It does this by being a node
on the MicroTrac LAN and also pretending to be one or more remote drops on
the Remote I/O network of the Texas Instruments PLC. These drops are
referred to as simulated drops because they are not physical drops with racks
containing real modules.
Several steps are required to begin the exchange of data; some deal with
configuring the Texas Instruments PLC, and some with programming the PAC
blocks in the MicroTrac LAN nodes.
As described above, the PLC gateway looks to the Texas Instruments PLC as
one or more bases. Even though these are simulated bases, the PLC treats
them as normal bases. Therefore, they must be defined as simulated bases in
the Texas Instruments Traffic Cop.
IMPORTANT: All slots in the TI Traffic Sop must be used by the drive
nodes. This can be accomplished by judicious PAC programming
or PLC configuration. An alternative method is to use a MagneTek
TI Gateway ROM configuration EPROM in the gateway.
Use the following information when assigning modules in the rack:
1. A base cannot be both real and simulated, so choose a base
number that is not already use by real drops.
2. Simulated base numbers can be in the range of 1 to 9.
OPERATION
Configuring the
Texas
Instruments
545 PLC
RD 3056-10