HMS Anybus HMS-EN2MB-R, User Manual, Page: 35 / 72

Appendix A: Data Transactions 33 (70)
A Data Transactions
A.1 I/O Mapped Data
I/O mapped data is cyclic data, exchanged between the networks and/or devices at a high
transfer rate. It’s associated with implicit messaging, where data is continuously sent on the
network.
A.2 Parameter Data
Parameter data is usually exchanged acyclically to set or change parameters in devices before or
during normal process. Acyclical data is set up as explicit messages using CIP message
instructions in Studio 5000.
Typical explicit messages that can be retrieved from the module by the scanner of the EtherNet/
IP network are the transaction status list and the exception code list.
A.3 Control/Status Word
In the direction from the PLC to the linking device, a control word can be enabled.
In the direction from the linking device to the PLC, a status word and a Modbus-TCP server live
list can be enabled.
The control/status word can always be retrieved using acyclic access. The control/status word
can also be I/O mapped as cyclic process data as a configuration parameter in the user interface.
See ..(add link to Ethernet IP Adapter Interface).
The control word is a 16-bit word (uint16) used by the PLC on the EtherNet/IP network to control
the linking device and thereby also the Modbus-TCP network.
Bit Value Description
0 (Least
significant bit) 0 Puts the linking device in idle state
1
Puts the linking device in run state
1
-
A reboot of the linking device is triggered by a rising edge, i.e. a transition
from 0 to 1
2-7 Set to zero Unused
8-15 Set to zero Unused
The status word is a 16-bit word used by the linking device to report its current actual status to
the PLC on the EtherNet/IP network.
Bit Value Description
0 (Least
significant bit) 0 The linking device is in idle state
1
The linking device is in run state
1
-
This bit is reflecting the state of bit 1 in the control word
Either 0 or 1
2-7
(reserved) Unused
8-15
(reserved) Unused
A.4 Live List
The PLC on the EtherNet/IP network can retrieve a live list containing the status of every
transaction on the Modbus-TCP network.
Linking Device User Manual
scm-1202–181 2.0 en-US