It is one time password or OTP which is needed to set your desired ATM or CREDIT CARD pin.
Due to security reason, new customer get only green pin.
How to generator new green pin when you lose current
You can generate new one by visiting nearest ATM. You need to carry your registered mobile number with you otherwise you will not able to proceed.
Swap your ATM and click upon generate new green pin and you will receive OTP on your mobile then input in ATM.
Now you will receive new one on your mobile.
You can do either by visiting your home branch.
Using net banking
If you already activated net banking then you can easily generate new green pin.
Generator actual ATM PIN using green
If you have PNB account then you can generate actual ATM PIN by visiting PNB official website or visit nearest ATM centre.