Watlow EM Gateway User Manual

EM Gateway

User’s Manual

For Watlow part number EM00-GATE-0000

1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: [phone], Fax: [phone], Internet: http://www.watlow.com

0600-0040-0001 Rev D $10.00 February 2004

EM Gateway

Table of Contents

Chapter 1: Product Overview 4

Ethernet Gateway 4
Ethernet Gateway Architecture 4
Program Upgrades 5

Chapter 2: Installation and Wiring 6

Dimensions 7

Chapter 3: Configuration 8

Getting Started 8
Network Services 8
Email Alarm Notification 8
Data Logging 9
Control Monitoring and Configuration 9

Chapter 4: HTML Pages 10

EM Gateway 10
EM Gateway Setup 11
EM Gateway Network Setup 12
EM Gateway Email Setup 13
EM Gateway Clock Setup 14
EM Gateway Serial Statistics 15
EM Gateway Network Statistics 16

Chapter 5: Controller Parameters and Registers 17

Series 96 – non-ramping 17
Series 97 17
Series 981 / 982 17
Series 988 / 989 18
Series 998 / 999 18
Series F4S / F4D 18
Series F4P 19
MicroDin 19
Power Series 19
CLS200 Series 20
Series SD – non-ramping 20

2

EM Gateway

Table of Contents – cont.

Chapter 6: Reference Documents 25

Reference Documents 25
Serial Numbers 25

Chapter 7: Specifications 26

Power Supply 26
Environmental 26
Indication 26
Agency 26
Communications 26
Control Output Signals 26
Enclosure Size 26
User Interface 26
Ordering Information 26

Declaration of Conformity 27
How to Reach Us 28

3

Chapter One

Product Overview

The EM00-GATE-0000 is a gateway / bridge that allows up to 32 Watlow controllers to be directly
connected to an Ethernet network. Using an HTTP Browser such as Microsoft Internet Explorer or
Netscape Navigator you may access 16 controllers and view several controllers’ parameters via an
onboard Web (HTTP) server.

Ethernet Gateway

The Ethernet gateway provides a means for monitoring and configuring runtime parameters of multiple
controllers via a web browser. The gateway is also a bridge for Modbus messages between the Ethernet
bus and EIA-485 or EIA-232 links. The Gateway supports full product configuration; monitoring and
configuration of runtime parameters via MODBUS TCP over TCP/IP using a software package such as
Watview sold by Watlow.

Ethernet Gateway Architecture

This product has three physical connectivity points to the physical world. They are the serial (EIA-485 or
EIA-232), Ethernet port (10BaseT), and the power supply pins.

The EIA-485 / EIA-232 connection supports Modbus RTU protocol and operates as a Master port. It will
initiate data read/write requests to supported standard Watlow controllers. There exists a virtual image of
the controller’s data points in the gateway. The polling engine that initiates the Modbus RTU requests is
responsible for synchronization of the virtual image and the actual controller. Changes to control data
occur both at the controller and at the virtual image.

The 10BaseT connection supports the TCP/IP stack. At the application layer it has an HTTP (web) and
Modbus server. The HTTP server will provide current controller status from the virtual image via HTML.
The HTTP server provides a means of changing some runtime parameters via HTML. The TCP/IP stack
supports DHCP client, AutoIP, static IP, DNS client, and Netbios name resolution. The 10BaseT
connector is an RJ45 per the IEEE 802.3 specification.

The EM00-GATE-0000 can be used as a bridge for Modbus RTU messages. This is concurrent with all
other communicating functions. In this scenario, the gateway simply passes the request that comes in on
the Ethernet connection through to the EIA-485 or EIA-232 connection. When the response is returned
from the controller, it is sent back on the Ethernet connection. No processing of the packet contents is
necessary to bridge the two physical layers.

Block Diagram of Gateway

PowerSource

RS-485

EtherNet

TCP/IP

Modbus

TCP/IP

TFTP
Client

WEB

Server

GATEWAY

Virtual
Image

Modbus

RTU

Poll

Engine

4

Program Upgrades

The gateway has a TFTP server for the purposes of reprogramming the program memory. A program
update will be initiated when a TFTP client, residing on a PC, begins to write a new program file to the
gateway TFTP server. When reprogramming the program memory, all other gateway services are
unavailable.

The gateway provides no means of updating the program memory of controller devices, such as flashing
new information into the Series F4.

5

Chapter Two

Installation & Wiring

UL Approved, Class 2 power supply
required

6

Dimensions are in inches

7

Chapter Three

Configuration

Getting Started

Perform these steps;

1. Connect the EM00-GATE-0000 gateway to your computer’s Ethernet port using a cross-wired RJ45
cable or connect the EM00-GATE-0000 to a hub or network using a straight wired RJ45 Category 5
cable. The EM00-GATE-0000 is limited to a 10BaseT connection and will not work on an Ethernet
port set for 100BaseT only. Use of a 10/100 hub will overcome this issue if your PC has only a
100BaseT port.

2. Wire the temperature controllers to the gateway’s EIA-485 port. You may connect the gateway’s EIA­232 port to a controller if you will be using only one controller, provided that the controller has an EIA­232 port.

3. Wire a 24-volt AC or DC power supply to the gateway terminals. This is not polarity sensitive.

4. Configure each controller to the same baud rate (9600 or 19200) from the front panel of the
controller. Set each controller’s Modbus address to a unique number. As an example, set the first
controller to address 1, the second to address 2 and so on.

5. Power up the gateway, controllers and PC.

6. Start your Internet browser. Enter the TCP/IP address of the gateway into the browsers’ address field.
Two different addresses may be used to access the gateway. Either EMxxxxxx, where xxxxxx is the
first six digits of the serial number, or WATxxxxxx, where xxxxxx is the last six digits of the gateways’
MAC address. The MAC address is printed on a decal in the form xx:xx:xx:xx:xx:xx.

7. Select the Gateway Setup Page. Enter User name ‘new’ and Password ‘user’ by default. The
Password can be changed on the Security Configuration screen.

8. Configure the Baud Rate and range of controllers’ addresses to match those you configured in step
four.

9. Click on Rescan Modbus Network

10. Click on the back button of the browser to return to the previous page.

11. Click on the refresh button of the browser and your controllers’ information should now be visible.

Note: You must click on the refresh button within the browser to capture the latest controller information.
This information is automatically refreshed after 10 seconds by default. You may change this refresh time
using the appropriate page.

Network Services

The EM00-GATE-0000 supports DHCP client, autoIP, and static IP for address assignment. Normally you
will not need to make any changes. The user is able to configure preferences as to which services are
used if available. Intelligence is employed within the gateway to revert to backup IP assignment methods
if the primary method is unavailable.

The gateway does support DNS client and Netbios name resolution. Configuration information may be
entered at the EM Gateway Network Display Setup page.

Email Alarm Notification

The email function allows the user to send emails to four addresses alerting them of alarm conditions that
have occurred on the controllers connected to the Gateway. A button on the Graphical User Interface
(GUI) allows the user to enable or disable this feature. Emails can be generated whenever an alarm
condition occurs for each controller. An email acknowledge feature requires that the user acknowledge
the email message by operating the email acknowledge button before additional email alarm messages
can be generated for that controller. For multiloop controllers only one email acknowledge feature is
supported; if more than one loop produces an alarm, only the first alarm detected will generate an email
until acknowledged.

8

You will need to configure your Gateway with your SMTP server name or address. A DNS server address
must also be configured if using a SMTP name. Contact your system administrator if you don’t know the
SMTP name or address.

Data Logging

The gateway provides no explicit means of data logging. Data can be polled via Modbus TCP by an
external PC program. Consider WatView from Watlow for your setup, data logging and graphing needs.

Control Monitoring and Configuration

The gateway provides a means of monitoring the current process value for analog inputs of each
controller using a built-in HTTP server. It also provides a means of monitoring the present alarm status of
each controller. Additionally, you may monitor and change control set points for control loops of each
controller.

The gateway is capable of supporting Watlow Series 96 non-ramping, 97, 981, 982, 988, 989, 998, 999,
F4S, F4D, F4P, MicroDin, Power Series, CLS200and SD non-ramping controllers with up to 16
controllers in any combination.

The gateway is capable of automatically determining when a controller is connected to the serial bus. It
will identify the model and address of each controller. Controllers with duplicate Modbus addresses will
be ignored by the gateway.

You can configure the baud rate of the EIA-485 or EIA-232 bus. You may also specify which controller
addresses are scanned under the EM Gateway Setup page. The gateway supports from 1 to 16
controllers in any combination of supported model numbers. Select Rescan Modbus Network to update
the detection of controllers on the bus. The Modbus network is automatically scanned every two minutes
for new devices.

9