System Access Module

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  The SAM provides digital communications between the SETPOINT rack and external systems such as Distributed Control Systems (DCS), Programmable Logic Controllers (PLCs), and other instrumentation via MODBUS™ TCP/IP communications.

Overview

 

The System Access Module (SAM) provides digital communications between the SETPOINT rack and external systems. Two SAM versions are available: basic (bSAM) and enhanced (eSAM).

 

bSAM

The bSAM provides an Ethernet port with NTP protocol for time synchronization to an external clock and MODBUS™ TCP protocol for connection to Distributed Control Systems (DCS), Programmable Logic Controllers (PLCs), and other automation systems.

 

eSAM

The eSAM provides all of the functionality of the bSAM, but adds a second Ethernet port for supplying waveform data directly to appropriate condition monitoring software using our industry first Open Data protocol, or a specially developed API (Application Programming Interface) for connection with OSIsoft’s PI system. The eSAM also contains additional components not found in the bSAM, and used to drive the rack’s optional touchscreen display.

Protocols supported include:

MODBUS TCP – used for connection to PLC, DCS, and other environments using Ethernet communications; supplies channel values and status conditions (not used for supplying vibration waveforms - see SETPOINT Open Data below)

MODBUS RTU – identical dataset as MODBUS TCP, but uses serial communications (RS-232, RS-422, RS-485) rather than Ethernet

NTP (Network Time Protocol) – used for synchronizing SETPOINT system clock with external systems

SETPOINT Open Data – an industry-first open protocol that is available for use by anyone; used for supplying same data as available via MODBUS protocol, but includes vibration waveforms necessary for condition monitoring; compatible with OSIsoft’s PI system and SETPOINT CMS Condition Monitoring Software.

The list of embedded protocols is constantly expanding and modules already in the field can be upgraded in-situ using the latest version of SAM firmware. A variety of external media and protocol conversion modules are also available for communicating with systems that use Allen-Bradley DF1, Profibus, Fieldbus, GE Ethernet Global Data (EGD), and many others.