Omron PROFIBUS DP GATEWAY Operation Manual page 24

PROFIBUS DP Gateway
Compoway-F
K-Format
Host Link
Memobus
IBM compatible Personal
Computer
I/O Data
Fixed Communication
Blocks
Free Communication
Blocks
The PRT1-SCU11 is present on the PROFIBUS DP network as a slave unit.
The interface of the PRT1-SCU11 is controlled by a Master unit on the net-
work. This Master unit can be any PROFIBUS DP class 1 or class 2 master
Compoway-F is the OMRON proprietary serial communication bus system,
based on RS-485, to communicate with a range of OMRON Temperature
Controllers.
The K-Format protocol is the OMRON proprietary serial communication bus
system, based on either RS-422A or RS-485, to communicate with OMRON's
E5AK/E5EK Intelligent Digital Controllers.
Host Link is the OMRON proprietary serial communication bus system, based
on RS-422A, to communicate with the OMRON/Yaskawa R88A-MCW151-E
option board for W-series servo drives.
The Memobus protocol is the Omron-Yaskawa variation of the Modbus RTU
Protocol used to communicate over either RS-422A or RS-485 with Omron-
Yaskawa F7 Inverters.
An IBM compatible Personal Computer is connected to the PRT1-SCU11
PROFIBUS DP Gateway via a RS-232C serial communication to the auxiliary
port. Application programs running on the Personal Computer can communi-
cate through the auxiliary port with Compoway-F, K-Format and Memobus
components, thus bypassing the PROFIBUS DP interface. The Host Link pro-
tocol is not supported by the Auxiliary port.
The data exchanged over PROFIBUS DP are word sized, and represent
either fixed length communication blocks or Free Communication blocks. The
PRT1-SCU11 PROFIBUS DP Gateway limits the total number of input words
to 100 words, and the total number of output words to 100 words.
Fixed Communication Blocks are I/O modules with predefined parameter con-
tent. These modules are to be used to send output and control data to a
device and read status from a device. These I/O modules are defined in the
PRT1-SCU11 and cannot be changed by the user. They are the most com-
monly used and straight forward way to exchange data between a Master and
one or more of the devices attached to the PRT1-SCU11.
In general there are at least two Fixed Communication Blocks defined for
each device type or group of devices attached to a PRT1-SCU11. One block
is always available for limited I/O data, e.g. setpoint and process value, and
one block is available for extended I/O data transfer.
Free Communications Blocks, are predefined I/O modules, which allow the
user to send any read, write or operate instruction to any attached Compo-
way-F, K-Format or Memobus device without unit interference. The informa-
tion in the Free Communication Block is used by the PRT1-SCU11 to
assemble the correct message format.
Three types of Free Communication Blocks are defined, the types are Oper-
ate, Read and Write.
• Operate: Execution of a special operation command, which is defined in a
controller.
• Write: Execution of a write data command to any parameter defined in a
controller.
• Read: Execution of a read data command of any parameter defined in a
controller.
Section 1-3
9