Table of Contents
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1 Introduction
1.1
Product Summary
The S7-I/O device is an addressable modular input/output
(I/O) device that links power system components to the
ACCESS™ electrical distribution communication system.
The device can monitor or control components that are not
specifically designed for digital communication.
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Figure 1.1 S7-I/O Device
The S7-I/O device is designed for use with WinPM™, Sie-
mens' Microsoft Windows™-based power monitoring and
control software. The device communicates with a supervi-
sory computer running WinPM by way of the SEAbus com-
munications protocol.
The S7-I/O device operates as a field device on the
ACCESS communications system. It has a digital address
and is polled on a regular schedule by a supervisory com-
puter. The supervisory equipment can be either a PC, a
PLC, or other compatible supervisory device. Speed of
response depends on the number of field devices con-
nected to the 485 communications loop.
Connection to the ACCESS system is self-contained. An
RS-485 serial link is used to communicate counter data,
event log data, and the status of inputs and outputs. In
addition, the S7-I/O device allows manual control of all out-
puts via WinPM.
1.2
Applications
The S7-I/O device can remotely monitor any device
equipped with an auxiliary contact, such as a molded case
circuit breaker or transformer temperature relay. This capa-
bility makes it particularly useful in applications that require
monitoring or controlling power system elements that are
not specifically designed for digital communications. It can
also be used to count and communicate the pulsed output
from a kilowatt-hour meter.
Outputs from the device have a variety of uses, such as
closing contactors, tripping circuit breakers, providing
remote indication, and providing various degrees of alarm-
ing.
Typical applications of the S7-I/O device include
•
Reporting transformer winding temperature
•
Monitoring breaker status
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Monitoring alarm status
•
Opening and closing of breakers remotely
•
Providing other remote control and communications
functions
1.3
Features
The S7-I/O device is the link between the ACCESS electrical
distribution communication system and the rest of the
power system. It provides the following features:
•
14 digital inputs and 10 digital outputs on the base unit.
•
I/O capability in blocks of 8 up to a total of 54 inputs or
50 outputs.
•
On-board control power for expansion modules.
•
Counters on the first 8 inputs of the base unit.
•
Pulsed or latched digital states on outputs (Pulsed out-
puts can be used for breaker operation control).
•
Relay contact outputs that can be controlled manually.
•
Capability of using dry contacts as inputs (Signal volt-
age is provided through the internal power supply).
•
Capability of accepting external power at 120 VAC,
240 VAC, or 24 VDC.
•
Standard DB-9 connection port for connection to an
RS-485 network.
•
Analog input capability up to a total of 12 inputs.
1.4
Where to Find More Information
This manual contains information on installing, connecting,
maintaining, and using the S7-I/O device within the
ACCESS system. Other sources of information are:
•
S7-I/O SEAbus Protocol Reference Manual
•
WinPM Software User's Manual
•
ACCESS System Installation Guide
1
Introduction
3
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