Sercos® ring parameter: OpticalPower

Description

This parameter enables you to set the optical power (light output) of the SERCOS® loop transmitter (LED).

The value is given as a percentage, with an actual resolution of change in power of 20%.

The minimum non-0 optical power is supplied at 66% percent. Full power is supplied at 100%. The LED output is cut if the value is 0%.

NOTE: The default value for the optical power is 66% percent. This value normally works with all SERCOS® drives and all cable lengths. It is possible that the optical power setting may need to be reduced if the length of optical fiber from between the movement controller and the first drive is extremely short. In this case, reducing the optical power may prevent overdriving the drive's receiver LED circuitry.

Associated Functions

The associated functions of this parameter are:

GetOpticalPower which sends a read request for the actual optical power of the transmitter,
SetOpticalPower, which sends a write request for the new optical power of the transmitter.

These functions use, according to the language objects, the WRITE_CMD, READ_PARAM or WRITE_PARAM instructions.

Associated Language Objects

The table below presents the different language objects linked to the OpticalPower parameter.

Object	Name	Function code	Instruction type	Description
%MWr.m.c.26	ACTION_CMD	1547	WRITE_CMD	Read command
%MWr.m.c.26	ACTION_CMD	2547	WRITE_CMD	Write command
%MFr.m.c.22	RETURN_CMD_2	-	-	Result of the read.
%MFr.m.c.31	PARAM_CMD_3	-	-	Value to write
%MWr.m.c.19	ERROR_CMD	-	-	Error report. See (WRITE_CMD Command: Programming Errors)