Temperature Sensor Pcb; Discrete I/O Pcb - Agilent Technologies VS Series Operation Manual

A.2.7 Temperature Sensor PCB
The Temperature Sensor PCB (Agilent P/N R2114301) provides direct temperature –to-
frequency conversion, where a period of the output square-wave 5 V-TTL signal is
proportional to temperature. Further conversion to 16-bit digital signal is provided by a
CPLD on the Motherboard PCB and sent to the CPU PCB via RS-232 port.
The Temperature circuitry resides on a stand-alone PCB directly placed on the Standard
Calibrated Leak and comprised of an TMP03 integrated circuit and a 4-pin connector (J1).
A.2.8 Discrete I/O PCB
The Discrete I/O PCB (Agilent P/N R32205B1) functions as liaison between the VS Series
leak detector and the external devices, such as PLC, PC and printer. The Discrete I/O PCB is
under full software control provided by the CPU PCB.
1. The Discrete I/O PCB circuitry provides:
Local CPU and memory (SDRAM and Flash) for serial-to parallel (Address, Data and
Control signals) conversion for the parallel I/Os
Parallel optically isolated input (8- lines) and Output (12-lines) interface between
the VS leak detector and external equipment (e.g. PLC)
RS-232 Isolated Serial communication interface with the CPU PCB via the
Motherboard PCB
The Discrete I/O circuitry resides on a stand-alone PCB comprised of six sections:
CPU and memory section
Isolated RS-232 section (system site) with a RJ45-8x8 connector (J100)
Isolated parallel interface section (customer site) with a 25-pin DB25 female type
connector (J103)
Power supply section with a 3-pin connector (J101)
2. Single valve channel:
Valve Driver PCB circuitry provides:
Local microprocessor control and valve failure detection signals for two solenoid
valves (one used only for the VS C-15)
Delayed pulse-width modulated (PWM) output voltage for the solenoid valves
+24 VDC to a +5 VDC conversion for the 5 V-logic.
The Valve Driver circuitry resides on an I/O PCB comprised of two sections:
Microcontroller and two valve driver cells section with two 12-pin connectors (J3
and J4)
Power supply with 3-pin connector (J2)
3. Orofinet Industrial Network (see Section 5 "Profinet Interface and Operation").
A-8
VS Series Component Leak Detector