Yes, tagout devices are one-half of lockout tagout. According to OSHA Standard, tags are a critical component of the Lockout/Tagout (LOTO) procedure to signal that the equipment under control may not be operated until the tagout device is removed. Workers are also safeguarded from hazardous power releases or inadvertent re-energizing of machines during routine maintenance or repair operations.
Each lock should have its own tag. Suppose multiple personnel is working on a machine. In that case, they should each put their own lock with their own tag separately so that no other person may re-engage the power while another is still working in hazardous energy.