Bronkhorst DeviceNet slave interface Manuel d'utilisateur télécharger pdf (Page 22)

BRONKHORST®

Page22DeviceNetinterface   9.17.026

4 OBJECTDESCRIPTION

4.1 SUPERVISOROBJECT

4.1.1 FLOW‐BUSinterfacing(viaRS232) 



ToenablecontrollingthedevicebyRS232,anewcontrolmodehasbeenadded:CTRL_RS232(18).Thiscontrolmode

isequalto CTRL_FB (0), butinthiscase thedevice will always makethetransitionto theEXECUTINGstate(nostart

request or receipt of I/O data needed). So CTRL_RS232

makes it possible to give setpoints without the need of a

DeviceNetconnection.



ThedevicewillonlybecompliantwiththeODVAprofilewhencontrolmodeisCTRL_FB(0).



In case of taking over control via RS232, it is possible to send value 18 to parameter “Control Mode” (FLOW‐BUS:

proc1, par4 or FLOWDDE: parameter 12). From this moment on, it will be possible to give setpoints without being

overruledbythesafestate.Thiscontrolmodewillbevaliduntilthenextpower‐upsituation.Controlmode=18will

notbestoredintonon‐volatilememory.Ateachpower

‐up,theinstrumentwillbenormallysettocontrolmode=0.



ThesafestateisactivewhenthedeviceisnotintheEXECUTINGstate.

ThefunctionalityoftheRS232FLOW‐BUS“ControlMode”parameterisnotthesameastheControl

ModeattributeintheSingleStateControllerObject(attribute0x05,object0x33).



4.1.2 I/Oassemblyinstancesselection

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Attribute0x66and0x67canbeusedtoselecttheI/OassemblyinstancesusedforthePolledI/Oconnection(seealso

PolledI/Oinput/outputparametersinEDSfile).



Devicenet InputI/Oassembly

obj0x30,attr102 instance

0 2

1 6

2 14

3 18



Devicenet OutputI/Oassembly

obj0x30,attr103 instance

0 7

1 8

2 19

3 20

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