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Watlow EZ-ZONE

PM Limit Controller • 39 • Chapter 4 Home Page

Communication Protocols

When using a communications protocol in conjunction with the EZ-ZONE PML there may be two possible

ports(instances)used.Port1orinstance1isalwaysdedicatedtoStandardBuscommunications.Thissame

instancecanalsobeusedforModbusRTUifordered.Dependingonthecontrollerpartnumberport2(in-

stance 2) can be used with Modbus, CIP and Profibus. For further information read through the remainder of

this section.

Modbus RTU & TCP Protocols

AllModbusregistersare16-bitsandasdisplayedinthismanualarerelativeaddresses(actual).Somelegacy

softwarepackageslimitavailableModbusregistersto40001to49999(5digits).Manyapplicationstodayre-

quireaccesstoallavailableModbusregisterswhichrangefrom400001to465535(6digits).Watlowcontrols

support 6 digit Modbus registers. For parameters listed as float notice that only one (low order) of the two

registers is listed, this is true throughout this document. By default the low order word contains the two low

bytesofthe32-bitparameter.Asanexample,lookintheOperationsPagefortheAnalogInputValue.Find

thecolumnidentifiedintheheaderasModbusRelativeAddressandnoticethatitlistsregister360.Because

thisparameterisafloatitisactuallyrepresentedbyregisters360(loworderbytes)and361(highorder

bytes). Because the Modbus specification does not dictate which register should be high or low order Watlow

provides the user the ability to swap this order (Setup Page, [Com] Menu) from the default low/high [lohi]

to high/low [hilo] .

Note:

With the release of firmware revision 7.00 and above new functions where introduced into the EZ-ZONE

product line. With the introduction of these new functions there was a reorganization of Modbus registers.

NoticeinthecolumnidentifiedasModbusRelativeAddressthereferencetoMap1andMap2registersfor

eachofthevariousparameters.TobebackwardscompatibleinyourprogramminguseMap1registers.To

be able to implement new functions in the Limit when and if they become available use Map 2 registers.

TheDataMap[map] for Modbus registers can be changed in the Setup Page under the [Com] Menu.

This setting will apply across the control.

It should also be noted that some of the cells in the Modbus column contain wording pertaining to an offset.

Several parameters in the control contain more than one instance; such as, profiles (4), alarms (4), etc... The

Modbus register shown always represents instance one. Take for an example the Alarm Silence parameter

foundintheSetupPageundertheAlarmmenu.InstanceoneofMap1isshownasaddress1490and+50is

identifiedastheoffsettothenextinstance.Iftherewasadesiretoreadorwritetoinstance3simplyadd

100to1490tofinditsaddress,inthiscase,theinstance3addressforAlarmSilenceis1590.

To learn more about the Modbus protocol point your browser to http://www.modbus.org.

Common Industrial Protocol (CIP DeviceNet & Ethernet/IP

BothDeviceNetandEtherNet/IPuseopenobjectbasedprogrammingtoolsandusethesameaddressing

scheme. In the following menu pages notice the column header identified as CIP. There you will find the

Class, Instance and Attribute in hexadecimal, (decimal in parenthesis) which makes up the addressing for

both protocols.

Data Types Used with CIP

int =Signed16-bitinteger

uint =Signed16-bitinteger

dint =Signed32-bits,long

real =Float,IEEE75432-bit

string =ASCII,8bitspercharacter

sint =Signed8bits,byte

TolearnmoreabouttheDeviceNetandEtherNet/IPprotocolpointyourbrowsertohttp://www.odva.org.

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