Part 2

424 Plug-In Assembly ConfigurationSetting the Counter Input CircuitsAs shown in the preceeding table, S1 and jumpers J3, J4 and J5 set the counterinput circuits. Figure 105 is a simplified block diagram of the counter input circuits(for isolated mode or nonisolated mode) and associated user input signalrequirements.Switch S1 sets the mode of operation for the counter. With S1 in the ISOL.ATEDposition, the counter is in isolated mode. This means that you can use floatingvoltage inputs to the counter, as long as the more positive voltage is connected toINPUT HI, the voltage difference between the inputs does not exceed 32V and thelow input does not exceed 170V.With S1 in NONISOLATED position, the counter is in nonisolated mode. In this mode,the INPUT LO terminal is the same as chassis ground for all practical purposes, soyou can't use floating voltages as inputs. However, your signal input current canbe much smaller than for isolated mode (30 to 750 as opposed to 8 mA forisolated mode).In nonisolated mode, you can use either the internal +5V voltage source on thecounter (referred to as an internal pullup) or an external source voltage to drive yourcircuit. Jumper J3 in the ON position puts the internal pullup in the circuit and J3in the OFF position removes it from the circuit.For either isolated or nonisolated mode, you can select + 5V, + 12V or + 24V logiclevels for your input circuits by using J4 when S1 is in the ISOLATED position orJ5 when S1 is in the NONISOLATED position.FACTORY SETTINGSS1 NON-ISOLATEDJ1 ISOLATEDJ2 ISOLATEDJ3 OFFJ4 5VJ5 5VJ6 INJ7 INTRJ8 NEG TRUEJ 1 J2 ~8Figure 104. Option 060 - SwitchIJumper PositionsArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com