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						The horizontal bus driver (HBD) module is a basic module which is installed in the I/O racks.The vertical bus flatcable between the Central Part and the I/O rack is connected to the HBD module via the back connector CN1 (see Figure 2). 
 
					 
					
						 
					 
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						10100/2/1  Data sheet 
					 
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						The flatcable which extends from the front of the module connects the HBD module to the horizontal bus above the I/O rack. 
 
					 
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						The address selection lines of the I/O modules terminate on the back of the horizontal bus(es) via a flatcable on connector CN3. 
 
					 
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						The HBD may be replaced with the power switched on, but the Central Part will shut down if the HBD is safety-related. 
					 
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