Woodward MicroNet Safety Module (MSM)

MicroNet Safety Module (MSM)

Overview

On January 30. 2018. Woodward will be releasing new “preferred” MSM models and a new Field

Software Conversion kit. The new MSM models include the same functionality as the older MSM

models but include many product improvements and enhancements requested by product line

users throughout the past years. After January 30. 2018. Woodward recommends customers who

are purchasing MSM units for use in new applications order part numbers from the “preferred”

part number list only.

This MSM software update provides enhanced math/computational functionality and adds over

100 logic blocks for use when programming this safety logic solver for a specific application.

The new Field Software Conversion kit can be purchased and used to upgrade/convert older

MSM models in the field to the new “preferred” MSM models by simply uploading/installing the

latest software program. Refer to below description of changes for a list of the improvements and

enhancements available. Refer to product manuals 35060v1 & 35060v2 for detailed product

information on these new “preferred” MSM models. Description of Changes

Description of Changes

New features

The following new computational blocks were added:

1. MULTIPLY block. Provides the product of all configured inputs. Up to five inputs per block.

Quantity 5.

2. DIVIDE block. Performs a divide function on the two inputs. Quantity 5.

3. ADD block. Provides the sum of all configured inputs. Up to five inputs per block. Quantity 5.

4. NEGATE block. Supports subtraction functionality by providing the negative value of the input.

Quantity 10.

Added the following new support blocks:

1. CURVE block (polygon): A 2-dimensional lookup based on a single, configured analog input. Up

to six breakpoints (coordinate pairs) can be defined. Values between breakpoints are

interpolated. Values beyond table-defined min or max are limited - equal to first or last point,

respectively; Quantity 2.

2. SWITCH block: Outputs one of two analog input values based on the status of the control input.

Example usage: selecting a default value for a calculation if an analog input is failed; Quantity

3. CONSTANT block: Allows definition of a fixed analog value to be used in conjunction with the

math/analog blocks; Quantity 40.

4. ANALOG UNIT DELAY block: Loop breaking block for analog signals, to define execution order.

Asserts a unit delay; Quantity 10.

5. COUNTER block: Provides a count indication as well as a comparison output which indicates

when a count threshold is exceeded; Quantity 10.

6. PEAK HOLD block: Captures and holds both maximum and minimum signal values; Quantity 10.

7. PULSE DETECT block: Monitors an analog signal and is used to detect a sudden rise in value

followed by a drop. The output indicates a pulse was detected; Quantity 5.

8. EVENT FILTER block: Provides an indication that an excessive number of events have occurred

within the defined window of time. Typically used in conjunction with the PULSE DETECT;

Quantity 5.

Changes to existing logic blocks:

Speed Loss (sudden speed loss): made the failure threshold configurable and expanded the

action selection to include ‘not used’.

Analog Output: Changes the source for the analog output to be configurable, allowing it to be

connected to analog logic blocks.

Analog Redundancy Manager: Added a difference detection to the Analog Redundancy Manager

blocks, providing a difference comparison between the three inputs. The difference indication is

provided if the threshold is exceeded for the configured time delay.

Difference Detect: Modified the block inputs to allow connection to any of the internal analog

logic signals (previously allowed connection to shared input signals only).

Analog Inputs: Increased the allowed range of the analog inputs to +/- 999999.

LAG blocks: Added a derivative (rate of change) output value to the LAG block for use in the

configurable logic. The lag time constant data type was changed from a fixed-selection

enumerated list to a numerical value from 0.004 to 10.

Resettable Trip: Modified the function input to allow connection to any of the internal Boolean

logic signals (previously allowed connection to discrete input 1-10 only).

Auto Sequence Test: Added the test result displayed on the front-panel for the entire sequence,

not just the local module. Removed the Continue Input selection, allowing the Start Input to

provide both functions. Added inter-module halt option.

The analog comparator ON and OFF inputs were modified to allow connection to any of the

internal analog logic signals (previously these were constant values).

Change the User Defined Test set input to edge triggered so the test does not repeat if set is left

true.

Logic execution rate changes: The discrete inputs are scanned at 1 ms (previously 4ms) and the

configurable logic runs at 8ms (previously 4ms).

Note: all speed, acceleration, trip, and output functions are unchanged.

Other Improvements and Additions:

Chinese language support added as a configuration setting.

Increased allowable ranges for speed settings from 32000 to 80000 rpm to facilitate turbo

expander applications. The maximum speed frequency remains at 32kHz.