Yaskawa Microtrac Gateway to Square D Sy/MAX Family of PLCs for use with Microtrac LAN - Manual (Page 5)

5
4/12/94
4 OPERATION
OPERATION
5/2/95
The ARCNET node number, as set on the MicroTrac Network Interface card
and referenced by the various PAC blocks, will usually be 200 (0C9H). To
allow for the possibility that more than one PLC gateway might be required on
a single MicroTrac DSD system, any node number from 200 through 246 may
be used.
The SY/LINK board in the PLC gateway is configured by the PLC Interface
software. The network broadcast is disabled, the RS-422 port is enabled, the
network size is set to 31, and the network baud rate is set to 62.5K baud.
The SY/LINK board is the PLC gateway is set to a SY/NET LAN network
interface number of 10. Therefore, the SY/NET LAN network address of the
PLC gateway will be 10, and the SY/NET LAN network address of the PLC
connected to the SY/LINK board will be 110. These network address are
needed for the PLC programmers when routing data over the SY/NET
network.
The PLC gateway interfaces directly with the data registers of the interfaced
PLC. The group of registers from 3501 to 3755 have been allocated for
MicroTrac DSD to PLC interface usage. It is unlikely that all of these
registers will be needed in a given drive system, so those that are not used here
can be utilized for other functions. As illustrated below, the PAC channel
numbers 1 through 255 will correspond to the “interfaced” PLC’s registers
numbered 3501 to 3755.
Register data transfers (for both logics and numerics) to and from the
“interfaced” PLC are done with WRITE operations. Therefore, input
operations (LOGI, NUMI, half of GETN, and half of RDCI) require a register
WRITE operation in the PLC ladder logic. Output operations (LOGO,
NUMO, half of GETN, and half of RDCI) are handled by an automatic
WRITE in the interface software, thus a ladder logic READ operation is not
required.
When the “interfaced” PLC prepares to send input (LOGI, NUMI, half of
GETN, and half of RDCI) data to the MicroTrac DSD drives, it must perform
a WRITE operation to the PLC gateway (SY/NET network address and route
number 10). The “interfaced” PLC MUST write its data to the PLC
gateway’s registers numbered 1 to 255, which correspond to PAC channels
numbered from 1 to 255. The PLC gateway will then send the data to the
DSD drives, via the ARCNET LAN, that desire the data.
The MicroTrac DSD drives will send output (LOGO, NUMO, half of GETN,
and half of RDCI) data, via the ARCNET LAN, to the PLC gateway. The
PLC gateway will then perform WRITE operations to the “interfaced” PLC
(SY/NET network address and route number of 110). The PLC gateway will
write the data to the “interfaced” PLC’s registers that correspond to the PAC
channel numbers allocated as outputs enabling the PLC gateway to convert the
OPERATION
RD 914-10