MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
Page 124 | 199
Each entry can be configured for one of two types of initiating a transaction:
Polled and Triggered.
Polled type entries initiate a transaction with the remote device on every transaction scan. Triggered
type entries only initiate a transaction when a corresponding local (OCS) binary trigger register is
set
.
Once a triggered type transaction completes, the protocol device driver
resets
the local (OCS) binary
register to indicate completion. Refer to the
for more details on Polled and Triggered
entries.
These basic types are also subdivided into Read or Write operations. For polled operations, a Read
operation only reads from a remote device. Likewise, a Read/Write operation continuously reads from
the remote device unless the target OCS register value changes from one ladder scan to another. In this
case, the new OCS value is written to the target device. For triggered operations, only a Read or Write
action is available.
When downloaded to the OCS, the Scan List is scanned sequentially to generate data transactions with
the remote device. This transaction scanning can be on a continual basis (
automatic
) or controlled from
ladder logic (
manual
) once a complex connection is programmatically created (i.e., dialup modem). The
specific transaction-scanning mode is selected from the
Network Config
menu.
The following Horner Automation websites offer OCS Protocol Software Downloads.
North America
http://hornerautomation.com/support-files/
Europe
https://www.hornerautomation.eu/support/
Please refer to the Cscape Help file for more information on Downloadable Protocols Configuration.
After opening the Cscape Help file, select
Contents
→
Networking and Communications
→
Protocol
Configuration.
