SMC Networks EX600-SPR Series Operation Manual page 20

PROFIBUS DP
LED status
Normal status with established communication with DP master, or power for control/input is
OFF.
SI unit recognized the communication speed but DP master address setting is wrong.
Check and correct the address setting
Any one of the following:
•No connection between DP master and SI unit.
•SI unit cannot recognize the communication speed.
•DP master failure or SI unit failure.
Communication established between DP master and SI unit, but with diagnostic error.
Discrepancy between DP master setting and device configuration data.
Check and correct the setting.
SI unit address set to "0" or above "126". Check and correct the address setting.
Descriptions
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No.EX##-OML0005