Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 27)

Publication 1753-UM001C-EN-P - March 2010 27
Overview of Safety Controllers Chapter 1
1755-OF8 Analog Output Module
The 1755-OF8 analog output module provides eight outputs,
galvanically isolated in groups of 2 (that is, 2 outputs per power
supply). They are electrically isolated from the processor system. Each
analog output can operate as a current source or a voltage source.
1755-HSC High Speed Counter Module
The 1755-HSC counter module provides two counters and four digital
outputs. They are electrically isolated from the processor system. The
status of the four output signals is displayed with status indicators
located at the right side of the front plate output connector.
Communication
Capabilities GuardPLC Ethernet Network
The GuardPLC Ethernet network provides safe communication via
Ethernet protocol for distributed I/O and peer-to-peer communication
for all GuardPLC controllers. It also provides non-safety-related
communication with the OPC server. Programming and configuration
of controllers is accomplished via the GuardPLC Ethernet network.
Various GuardPLC systems can be networked together on the
GuardPLC Ethernet network, using star or daisy-chain configurations.
A programming device running RSLogix Guard PLUS! software can
also be connected wherever required.
IMPORTANT
Make sure that a network loop is not generated. Data packets
must only be able to reach a node via a single path.