| 摘要 |
The present invention relates to an analog output module of Programmable Logic Controller (PLC), wherein a power supply unit fed with electrical power from the inside of PLC is additionally installed in at least one channel unit among multiple channel units to supply electrical power to the components in the channel unit when the outside power supply is blocked, thus enabling an analog output module to stably operate. The present invention provides the analog output module of PLC, which comprises: multiple analog channel units consisting of an analog unit converting a digital signal into an analog signal to make an output and a first power supply unit supplying electrical power to the analog unit; a second power supply unit installed in at least one of the multiple analog channel units to supply electrical power to the analog unit; and a power supply selecting unit directing a first electrical power supplied by the outside power supply unit to be provided to the first power supply unit, or a second electrical power supplied by a digital electrical supply unit to be provided to the second power supply unit. |
