From the rear of the MCU front panel, access can be gained to a 9-way D-type connector labelled
‘Programming and Configuration’ (see section 1.7). With the aid of an interconnecting cable
supplied by Status Scientific the following functions can be performed:
• Programming and Configuration of the MCU system via a P.C.
• Networking of MCU Control Units.
• Downloading of logged data.
A reset button is also located on the Microcontroller Module to allow the system to be reset locally
in the event of an irretrievable fault. This will ‘reboot’ the Microcontroller but will not erase
configuration data or logged data stored within the system.
1.2 Input Module
The input module monitors the status of an externally attached sensor and interfaces the signals
that it receives to the microcontroller module.
The input module is designed to accommodate virtually all sensor configurations currently
available. It can be connected to any sensor (Environmental or otherwise) that supplies it status
signal in any of the following formats:
(a) Current Loop 4 – 20mA from 24V source.
(b) Current Loop 4 – 20mA to ground.
(c) 3-Wire Pellistor Systems.
(d) Voltage Input.
Note:
Option (d) requires hardware configuration that should be made at the factory prior to dispatch.
Please request this option at time of ordering.
In addition the input module can re-transmit the signals for use by external equipment (e.g. chart
recorders). The transmitted signal can be configured using jumpers to provide one of three
output options:
• 4 – 20mA Current Source proportional to detected signal.
• 4 – 20mA Current Sink proportional to detected signal.
• 0-5V Voltage Output proportional to detected signal.
Up to eight input modules can be located within an MCU3 Control Unit; up to sixteen can be
located within an MCU4.
Situated on each Input Module are 3 Double Pole Change-Over Relays, each relay having
contacts rated at 5A (240V AC). These relays operate at Low, Intermediate and High alarm levels
when enabled. Status Scientific Controls are able to implement modifications to the software to
meet a customer’s specific requirement. Contact Status for further information.
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