The MAC Serial Input Manifold (SIM) is a slave device within the Profibus  network.  Thus, it will respond to all of the commands associated with the network like any other node of its type.  The PLC programmer will not have to make any special allowances with the Serial Input Manifold.

Since the MAC SIM Unit is nothing more than a node on the Profibus network, it can also be used in conjunction with our Outputs Only Serial Interface (SLIM) product or any other Profibus compatible system.

Each SIM Unit (as shown in Figure 3) occupies a single node in the network.  The output portion of the consumes 4 bytes (32 bits) so that the system can control up to 24 MAC solenoid valves plus 8 additional user defined outputs.

These user outputs can control remote valve stacks or any other output within the current and voltage specification of the output modules.  There can be up to two output modules with 4 outputs per module.   The location and addressing of these words will be discuss later in this document.