Integrated pneumatic logic module

A pneumatic logic control module comprising:

• first, second and third pneumatic relay valves each having first and second pilots which shift respective first, second and third valve spools into normal and active positions, respectively, when pressurized,
• each relay valve including a first pneumatic flow path which is non-passing when the spool is in the normal position and passing when the spool is in the active position, and a second pneumatic flow path which is passing when the spool is in the normal position and non-passing when the spool is in the active position,
• first, second and third "start event" pneumatic outlet ports,
• first, second and third "verification return" pneumatic inlet ports,
• a "turn off previous module" pneumatic outlet port,
• a "start this module" pneumatic inlet port,
• a "turn off this module" pneumatic inlet port,
• a pneumatic supply inlet port, and
• pneumatic circuit means for
• connecting the "start this module" inlet port to the second pilot of the first valve for shifting the first valve spool to the active position in response to a pressure signal applied to the "start this module" pneumatic inlet port,
• connecting the pneumatic supply inlet port through the first flow path of the first relay valve to the "turn off previous module" pneumatic outlet port,
• connecting the pneumatic supply inlet port through the first flow path of the first relay valve and the second flow path of the third relay valve to the first "start event" pneumatic outlet port,
• connecting the first "verification return" pneumatic inlet port to the second pilot of the second relay valve,
• connecting the pneumatic supply inlet port through the first flow path of the second relay valve to the first pilot of the first valve,
• connecting the pneumatic supply inlet port through the first flow path of the second relay valve and the second flow path of the first relay valve to the second "start event" pneumatic outlet port,
• connecting the second "verification return" pneumatic inlet port to the second pilot of the third relay valve,
• connecting the pneumatic supply inlet port through the first flow path of the third relay valve to the first pilot of the second relay valve,
• connecting the pneumatic supply inlet port through the first flow path of the third relay valve and the second flow path of the second relay valve to the third "start event" pneumatic outlet port, and
• connecting the "turn off this module" pneumatic inlet port to the first pilot of the third relay valve.

A pneumatic logic control module comprising:

• at least first and second valving means each having spool means shiftable between normal and active positions, and
• pneumatic circuit means cooperating with the spool means for
• shifting the first spool means from the normal position to the active position in response to a first pressure input signal to produce a first pressure output signal at a first outlet port which can be used to start a first event external to the module and for preventing a pressure signal from reaching a second outlet port, and
• shifting the second spool means from the normal position to the active position in response to a first verification pressure input signal to shift the first valving means back to the normal position to terminate the first pressure output signal and to produce a second pressure signal at the second outlet port which can be used to start a second event external to the module.