plc.py 文件源码

def set_attribute(self, class_id, instance, attr, value):
        """Set the value of attribute class/instance/attr"""
        path = CIP_Path.make(class_id=class_id, instance_id=instance)
        # User CIP service 4: Set_Attribute_List
        cippkt = CIP(service=4, path=path) / scapy_all.Raw(load=struct.pack('<HH', 1, attr) + value)
        self.send_rr_cm_cip(cippkt)
        if self.sock is None:
            return
        resppkt = self.recv_enippkt()
        cippkt = resppkt[CIP]
        if cippkt.status[0].status != 0:
            logger.error("CIP set attribute error: %r", cippkt.status[0])
            return False
        return True