The horizontal bus driver (HBD) module is a basic module which is installed in the I/O racks. The horizontal bus driver consists of two parts: • electronic part (10100/2/1), and • a A1, A21 or A22 flatcable. 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). The flatcable which extends from the front of the module connects the HBD module to the horizontal bus above the I/O rack. The address selection lines of the I/O modules terminate on the back of the horizontal bus(es) via a flatcable on connector CN3. The HBDs are used as follows: − 10100/2/1 with flatcable A1 used for non-redundant I/O − 10100/2/1 with flatcable A21 used for redundant I/O (one rack per HBD) − 10100/2/1 with flatcable A22 used for redundant I/O (two racks per HBD) The HBD may be replaced with the power switched on, but the Central Part will shut down if the HBD is safety-related.
Honeywell:
Alcont, Experion LS, Experion PKS, Experion HS, Plant Scape,TDC 2000, TDC3000, TPS, security systems.
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