Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 7)

MOD30ML and Modcell Maintenance
INTRODUCTION
SECTION 1
INTRODUCTION
1.1 GENERAL
The MODCELL and MOD 30ML instruments contain extensive internal diagnostics, which
continuously monitor instrument operation. If a malfunction is detected it is immediately
reported so that the user can take appropriate action. In addition, most routine instrument
events such as changes in operating state, switching of control modes, suppression or
enabling of various diagnostics, acknowledgement of alarm conditions, etc., are reported for
informational purposes. This diagnostic system provides, in effect, continuous instrument
maintenance. No periodic user maintenance activity is required when the instrument is
operating normally in the RUN state.
The purpose of this book is to provide detailed information about the instrument diagnostics,
and to provide procedures for accessing and using the diagnostic data to isolate a problem
and identify its cause. In the event that a malfunction is discovered, guidelines for corrective
action are provided.
1.2 INSTALLATION INTEGRITY
The procedures in this book are based on the assumption that the instrument has been
properly installed in accordance with the instructions in the installation instructions supplied
with the instrument. The applicable manuals are as follows:
IB-23C600 - Installation instructions for MODCELL Multi-loop Processor
IB-23C601 - Installation instructions for Remote I/O Modules (Extended I/O)
IB-1800R-INS - Installation instructions for MOD 30 ML,
IB-1800R-M30 - Installation instructions for the Mod 30ML Replacement for MOD 30.
IB-23A160 - Instructions for Instrument Communications Network (ICN) Planning
IB-MODBUS RTU – Communications Guide for use with Modcell, MOD 30ML and
Commander products
If a host computer is used with the ICN, instructions for setup of the communications link are
provided in the following manuals:
IB-23C001 - Instructions for 1720N Communications Link
IB-23C003 - Users guide for 17321N ICN Mini Link
IB-23C004 - Users Guise for 1733N Mini Link/External
The instrument diagnostics can identify some installation related problems such as burnout of
a thermocouple or a mismatch between the physical location of an I/O module and its
specified location in the data base configuration. For the most part, avoidance of installation
related problems depends on careful adherence to the installation instructions. Problems
related to electrical noise, input and output signals, and communication signals can result
from an improper installation. The instrument installation manuals provide detailed
connection information and typical connection diagrams for every I/O and communication
module, and for the built-in I/O and communication circuits in MOD 30ML. This information
should be reviewed when it is necessary to rule out the installation as the source of a
malfunction.
1 -1