The company says that "as a precaution" it has withdrawn batches of beef, chicken and bacon from the made-to-order sandwich trade.
Potentially contaminated meat had been supplied to Subway, which has confirmed that specific batches of its 'Philly Style Steak' and 'Chicken Fajita' products were also withdrawn from sale.
One of Dawn Farm Foods' production lines will remain closed until an investigation by the Food Safety Authority (FSAI) is completed.
While salmonella is not a life-threatening illness for most people, the FSAI warns that it can have "serious complications for older people, young children, pregnant women and people with already weakened immune systems".
Symptoms of the food poisoning through salmonella can include diarrhoea, stomach cramps, vomiting and fever.
The FSAI is working to identify the exact source of the salmonella outbreak and a list of affected products is available (and updated) on the FSAI's website www.fsai.ie.