> For the complete documentation index, see [llms.txt](https://grid-exchange-fabric.gitbook.io/gxf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://grid-exchange-fabric.gitbook.io/gxf/protocols/iec61850/swdevice-010805/setlight.md).
# SetLight
## Description
Request which commands the device to switch on or off one or several light relays. If optional value 'index' is omitted, all relays configured as light are switched. In that case, the message will contain exactly one LightValue and all relays will switch to that LightValue. In case the value 'index' is included, multiple instances of LightValue can be used (up to 6), each indicating a particular relay.
Response which returns the result of the request.
## IEC61850 Fields
| **ATTRIBUTE** | **FC** | **SUB ATTRIBUTE** | **DATATYPE** | **DESCRIPTION** |
| ------------- | ------ | ----------------- | ------------ | ------------------------------------------------------------ |
| XSWC2.Pos | CO | Oper.ctlVal | BOOLEAN | Flag which, if set to true, immediately switches relay 2 on. |
| XSWC3.Pos | CO | Oper.ctlVal | BOOLEAN | Flag which, if set to true, immediately switches relay 3 on. |
| XSWC4.Pos | CO | Oper.ctlVal | BOOLEAN | Flag which, if set to true, immediately switches relay 4 on. |
## Example
Soap requests and responses sent to and from platform:
```markup
SoapUI
Sander
LianderNetManagement
KAI-0000000053
true
LianderNetManagement|||KAI-0000000053|||20180925093054301
KAI-0000000053
SoapUI
Sander
LianderNetManagement
LianderNetManagement|||KAI-0000000053|||20180925093054301
KAI-0000000053
OK
```
IEC61850 platform message of the data set on the device:
```javascript
LogicalDevice: SWDeviceGenericIO
messageType: SetLight {
XSWC2.Pos[CO].Oper.ctlVal: true
XSWC3.Pos[CO].Oper.ctlVal: true
}
```
IEC61850 protocol adapter logging:
```
2018-09-25 09:30:54.775] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.Iec61850SsldDeviceService@createListOfInternalIndicesToSwitch:220 - creating list of internal indices using device output settings
2018-09-25 09:30:54.782] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850SetLightCommand@apply:66 - Trying to switch light relay with internal index: 2 on: true for device: KAI-0000000053
2018-09-25 09:30:54.783] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.h.DeviceConnection@createObjectReference:94 - Device: KAI-0000000053, ObjectReference: SWDeviceGenericIO/XSWC2.CfSt
2018-09-25 09:30:54.799] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850Commands@enableOperationOfRelay:56 - masterControl.enbOper is true, switching of relay 2 is enabled
2018-09-25 09:30:54.852] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.h.DeviceConnection@createObjectReference:94 - Device: KAI-0000000053, ObjectReference: SWDeviceGenericIO/XSWC2.Pos
2018-09-25 09:30:54.881] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850SetLightCommand@switchLightRelay:108 - Switching relay 2 on
2018-09-25 09:30:54.898] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850SetLightCommand@apply:66 - Trying to switch light relay with internal index: 3 on: true for device: KAI-0000000053
2018-09-25 09:30:54.898] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.h.DeviceConnection@createObjectReference:94 - Device: KAI-0000000053, ObjectReference: SWDeviceGenericIO/XSWC3.CfSt
2018-09-25 09:30:54.986] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850Commands@enableOperationOfRelay:56 - masterControl.enbOper is true, switching of relay 3 is enabled
2018-09-25 09:30:54.986] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.h.DeviceConnection@createObjectReference:94 - Device: KAI-0000000053, ObjectReference: SWDeviceGenericIO/XSWC3.Pos
2018-09-25 09:30:55.211] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.i.n.s.c.Iec61850SetLightCommand@switchLightRelay:108 - Switching relay 3 on
2018-09-25 09:30:55.553] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.s.DeviceMessageLoggingService@logMessage:52 - Sending iec61850LogItemRequestMessage for device: KAI-0000000053
2018-09-25 09:30:55.554] [osgp-tst-03] [iec61850RequestsMessageListenerContainer-11] INFO o.o.a.p.i.s.DeviceResponseService@handleDeviceMessageStatus:42 - OK device message status received: OK
```
---
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