Is there a neural network model of Pavlovian Learning? I am trying to find a computer simulation of Pavlovian learning. i.e. an action such as salivation in response to a stimulus such as a bell ringing. 

Most neural network models I've seen seem to be more about trying to recognise things such as handwriting or speech rather than the stimulus-response model. And they don't usually incorporate the temporal nature of Pavlovian learning. e.g. Ring a bell, wait a bit, give dog food.

Are there any computer simulations of this? (Do they have a name?) Is there a connected neuron model of this?
In general, what you're looking for is a biologically plausible model of reinforcement learning and/or conditioning. I know of two publications in particular that address this.

The first is A Biologically Plausible Spiking Neuron Model of Fear Conditioning and the second is A Spiking Neural Integrator Model of the Adaptive Control of Action by the Medial Prefrontal Cortex. They both using the Neural Engineering Framework and a learning rule to modify the connection weights between ensembles of biologically plausible spiking neurons. These connections are modified to create and destroy associations between stimuli and an action. However, in the second paper, it's shown that the mechanism can also learn timing information.