Emerson ROC827 instruction manual Issued Mar-06 General Information

ROC827 Instruction Manual

respective database point. These values are available for display and historical archiving.

SRBX Spontaneous-Report-by-Exception (SRBX or RBX) communication allows the ROC827 to monitor for alarm conditions and, upon detecting an alarm, automatically reports the alarm to a host computer. Any kind of communications link—dial-up modem or serial line—can perform SRBX as long as the host is set up to receive field-initiated calls.

Protocols The firmware supports both the ROC Plus protocol and the Modbus master and slave protocol. ROC Plus protocol can support serial communications and radio or telephone modem communications to local or remote devices, such as a host computer. The firmware also supports the ROC Plus protocol over TCP/IP on the Ethernet port. The ROC Plus protocol is similar to the ROC 300/400/500 protocol, since it used many of the same opcodes. For more information, contact your local sales representative.

The ROC800-Series firmware also supports Modbus protocol as either master or slave device using Remote Terminal Unit (RTU) or American Standard Code for Information Interchange (ASCII) modes. This allows you to easily integrate the ROC827 into other systems. Extensions to the Modbus protocol allow the retrieval of history, event, and alarm data in Electronic Flow Metering (EFM) Measurement applications.

Note: In Ethernet mode, the firmware support Modbus only in slave mode.

Security The ROCLINK 800 software also secures access to the ROC827. You can define and store a maximum of 16 case-sensitive user identifiers (User IDs). In order for the ROC827 to communicate, a case sensitive log-on ID supplied to the ROCLINK 800 software must match one of the IDs stored in the ROC827.

The operating system firmware supports the application-specific firmware supplied in the Flash ROM. The application firmware includes Proportional, Integral, and Derivative (PID) Control; FSTs; Spontaneous- Report-By-Exception (SRBX) Communications Enhancement; optional American Gas Association (AGA) Flow calculations with station support; and optional IEC 61131-3 language programs (using DS800 Development Suite software). Applications reside, so you do not need to re-build and download the firmware for changes in calculation method.

Input Module The ROC800-Series firmware, by default, supports 16 addressable Addressing points per module slot. However, to accommodate all the ROC827’s

expanded input capabilities (up to 27 module slots), you must set the firmware to support eight (8) addressable points per module slot. (Accomplish this using ROCLINK 800 and selecting ROC > Information. On the Device Information screen’s General tab, click the 8-Points Per Module radio button in the Logical Compatibility Mode frame.)

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