Reliable functioning of analyzers is of decisive importance for process control. It is necessary to record, correct and transmit measured values, to set and modify parameters, to check functions, to update calibrations, and to scan status signals e.g. for preventive maintenance. Communication between the operator and device is therefore an important part of process analysis, and the offered facilities have become a decisive performance feature of analyzers.

Extractive

The gas analyzers of Series 6 (ULTRAMAT 6, ULTRAMAT/OXYMAT 6, OXYMAT 6, OXYMAT 61, FIDAMAT 6 und CALOMAT 6) as well as the ULTRAMAT 23 offer the following communications facilities in addition to data transmission over analog and binary outputs:

• RS 485 interface
• SIPROM GA
• PROFIBUS DP/PA
• Generic communications interface (only OXYMAT 6, ULTRAMAT 6 and ULTRAMAT/OXYMAT 6).

RS 485 interface

The serial interface integrated as standard permits communication between several analyzers over the internal bus (ELAN). Parameterization is carried out using the analyzer's menu.

Networking over ELAN

ELAN communication is used e.g. for the correction of cross-interference. Direct connection is only possible between Siemens gas analyzers.

Bus cable with plug connections, ELAN networking

Bus terminating resistors

Pins 3-7 and 8-9 of the first connector of a bus cable must be bridged (ELAN networking).

Note

It is advisable to install a repeater on the device side in the case of a cable length of more than 500 m or with high interferences.

Networking with SIPROM GA

When used externally, the RS 485 interface requires software matched to the analyzers, e.g. SIPROM GA.

SIPROM GA is a software program for communication between PC/laptop and analyzers. A maximum of 12 devices (electronics modules) with up to four channels/measured components of the following type can be connected, displayed and remote-controlled per COM interface:

• OXYMAT 6/61
• OXYMAT 64
• ULTRAMAT 6
• CALOMAT 6
• CALOMAT 62
• FIDAMAT 6
• ULTRAMAT 23

SIPROM GA allows access to device parameters, right up to the configuration of devices. All analyzer functions (except factory default functions) can be remote-controlled and monitored in this manner. SIPROM GA is therefore an ideal servicing and maintenance tool for Siemens gas analyzers.

In addition to remote control of all operator functions, SIPROM GA offers complete access to all diagnostics data. SIPROM GA therefore permits preventive maintenance as well as fast responses when maintenance becomes necessary or when the production sequence is changed.

SIPROM GA ensures:

• High operational reliability
• High availability
• Central, comprehensive information
• Fast response time
• Flexibility
• Economical system integration

In addition to output of TAG No., components, current measured values, comprehensive diagnostics information (status) and parameter settings on the analyzer display, SIPROM GA also offers the following features:

• Bargraph display
• Recorder display of one or more measured values with printer output
• Calibration functions (adjustment of all setpoints for calibration, remote calibration)
• Saving of all device data
• Remote control of all device functions
• Remote calibration
• Online help
• Downloading of new device firmware
• Cyclic saving of measured values on hard disk
• Writing user data to the device's EEPROM, or downloading data from it.

Access to the analyzers using SIPROM GA is carried out either:

• directly from the PC over an RS 485 interface or
• over an Ethernet gateway

Hardware requirements

The following hardware and system requirements must be provided for the PC/laptop configuration in order to use SIPROM GA:

• Windows computer with Pentium 133 MHz and 32 MB RAM:
  Recommendation: Pentium II 266 MHz and 64 MB RAM
• CD-ROM drive (for installation)
• Vacant hard disk capacity of at least 10 MB
• VGA graphics card (Windows-supported);
  resolution: 1024 x 768
• Printer (Windows-supported)
• MS-Windows 95, ME; NT 4, Windows 98, Windows 2000 or Windows XP operating system
• Vacant COM port (COM 1, 2 ...)
  • The RS 485 / RS 232 interface converter is required for coupling to the RS 485 ELAN network
  • A standard 10-Mbit or 100-Mbit network (RJ45 connection) with TCP/ IP is required for connecting the Ethernet / RS 485 interface converter

Accessories for the network

For cables, connectors, repeaters etc., see Catalog IK PI or CA 01 on the Mall under SIMATIC NET communications systems/PROFIBUS/network components.

Networking with SIPROM GA via converter

Up to 12 analyzers with max. four components each can be networked.

The functional principle is shown in the following illustration.

Typical design of an RS 485 network with SIPROM GA

The gas analyzers can be installed at distances up to 500 m. One network can be connected to each COM port.

Networking with SIPROM GA via Ethernet

When networking with Ethernet, there are no limitations for the distance between PC and gateway. In addition, communication over Ethernet permits connection of several gateways to one COM port, and thus the possibility for monitoring and operating several widely distributed or separately installed analyzers/systems from one station.

Typical design of an RS 485 Ethernet network with SIPROM GA

PROFIBUS

The usual transmission of measured values and fault messages via analog and binary outputs requires complex cabling. On the other hand, when using PROFIBUS DP and PROFIBUS PA, one single two-wire conductor is sufficient for digital transmission e.g. of all measured values (also from several channels), status information or diagnostics functions for preventive maintenance.

The PROFIBUS DP version with its high transmission rate for relatively small data quantities per device is widely used in production automation, whereas PROFIBUS PA takes into account the features important for process engineering, e.g. large data quantities and use in hazardous areas.

The limited dynamic performance of 4 to 20 mA mA signals can be replaced, the laborious configuring of measuring ranges can be omitted. By using simulated measured values without media, increased safety can be provided for the plant configuration, and configuration errors can be avoided. Parameter sets can be generated offline (from your desk) and subsequently downloaded and saved in the device. Local operations can thus be reduced to a minimum.

The Siemens gas analyzers

• OXYMAT 6/61
• OXYMAT 64
• ULTRAMAT 23
• ULTRAMAT 6
• CALOMAT 6
• CALOMAT 62
• FIDAMAT 6

are PROFIBUS-compatible when using an optional plug-in card (retrofitting also possible) and therefore comply with the "Device profile for analyzers" defined as binding by PI (PROFIBUS International).

Customer benefits include an enormous savings potential in all plant areas, covering configuration and commissioning, operation and maintenance, up to subsequent plant expansions.

Operation of the gas analyzers from a control system or a separate PC is possible using the SIMATIC PDM (Process Device Manager); this is software which executes under Windows and which can also be integrated into the SIMATIC PCS 7 process control system. This permits a clear presentation for integration of the analyzers in the system as well as for the complex parameter structure of the analyzers.

Direct connection of the analyzers to a control system is also possible without PDM, e.g. using STEP7, but this necessitates additional programming and offers less user friendliness. In most cases, this direct connection is therefore only applicable if acyclic (device operation) data are not used.

A differentiation is made between cyclic and acyclic services. Cyclic services are used to transmit time-critical data such as measured values and statuses. Acyclic services permit scanning or modification of device parameters during operation.

Both graphic displays and values can be output on a PC. Signaling of maintenance, fault and diagnostics information is also cyclic. These data are displayed in plain text when using SIMATIC PDM.

The binary outputs can also be switched using cyclic services, thus also permitting triggering of relays over PROFIBUS (e.g. for measuring point switchover, calibration etc.).

Schematic structure of a PROFIBUS system

The following acyclic device parameters and configurations can be used in PROFIBUS DP and PROFIBUS PA by means of SIMATIC PDM:

• Factory data
• Diagnostics values
• Logbook
• Display measuring ranges
• Zero calibration
• Sensitivity calibration
• Setpoints for zero/sensitivity
• Total/single calibration and AUTOCAL
• Select measuring ranges
• Define measuring ranges
• Electric time constants
• On/off functions
• Chopper frequency
• Magnetic field frequency
• Date/time
• Measuring point switchover
• Logbook settings
• Relay assignment
• Binary inputs
• Reset
• Save/load data
• Suppression of short noise signals
• Calibration tolerances
• Switch valves
• PROFIBUS configuration

Use of PROFIBUS offers the following customer benefits:

• Cost reductions for planning, installation and operation
• Use of (distributed) device intelligence
• Replaceability of devices
• Only one cable for everything, no complex cabling
• No limited 4 to 20 mA resolution
• No laborious parameterization of measuring ranges
• Simulation of measured values
• Simplification of commissioning
• Testing of network/AS
• Avoidance of errors during startup
• Online diagnostics
• Offline parameterization

Generic communications interface
(only OXYMAT 6, ULTRAMAT 6 and ULTRAMAT/OXYMAT 6)

User benefits are offered thanks to numerous functions which are mainly required in the automotive industry, for example to carry out repeated linearization. In contrast to PROFIBUS and ELAN, communication is only possible between one device and one PC, and takes place according to the master/slave principle. The device only transmits data when requested by a command telegram, where only one command can be processed and replied to at a time.

The generic communications menu can be called using Function88, and the parameters adjusted.

Continuous gas analysis/in-situ

LDS 6 can send and receive data over an Ethernet connection together with the LDScom software. This installation and service tool is able to check and adapt device status and calibration parameters from a remote location. If necessary, even a complete system check can be carried out over the remote connection. If servicing is necessary, the required information can be sent to the Siemens service engineer by modem, and he can then carry out the appropriate measures from the remote location.

This facility for remote maintenance and diagnostics is implemented using a standard LAN modem.

External connection of LDS 6 via a modem for implementing remote maintenance measures