Honeywell VRX180 BCD Prompts, Example #1, loading a 2-profile program, OUT High Limit BIT

Programming Function Blocks and Features

BCD

Converts up to 8 discrete inputs’ binary coded decimal into an unsigned integer and output the integer as CVn OV. For example, 00000100 = 4.

On the instrument, when the enable is triggered, the set point program specified by the value of CVn OV is copied from internal storage to the Profile function block(s) where the profile(s) can be programmed or executed.

Table 4-31 describes the BCD prompts. See Table 4-2 for additional prompts.

Table 4-31 BCD Prompts

Prompt		Range/Selections		Definition
OUT LOW LIMIT		OFF or number		Displayed output value will be clamped and will flash when
				these limits are exceeded.
OUT HIGH LIMIT
BIT 0		OFF, discrete parameter, 0,		The binary coded decimal represented by the states of these
through	1			discretes will be converted into an unsigned integer. BIT 7 is
				the most significant bit and BIT 0 is the least significant bit.
BIT 7
ENABLE		OFF, discrete parameter, 0,		On the instrument, when this discrete transitions from off(0)
	1			to on(1), the specified program’s profile(s) will be loaded from
				internal memory to the Profile function block(s). See Table
			4-32.

Example #1, loading a 2-profile program

You are programming a 2-programmer instrument. According to Table 4-32, a 2-programmer instrument can run 2 profiles at a time and can store in its internal memory up to 6 programs, each containing 2 profiles.

Suppose the BCD bits are programmed as follows: Bit 2 = 1, Bit 1 = 1, Bit 0 = 0. This sequence of bits equals the number 6 and is the value of CVn OV. When the Enable discrete is triggered ON(1), the profiles in Program #6 will be loaded from internal memory into the function blocks for Profile #1 and Profile #2, where they can be edited or run.

Example #2, loading a 4-profile program

You are programming a 4-programmer instrument. According to Table 4-32, a 4-programmer instrument can run 4 profiles at a time and can store in its internal memory up to 3 programs, each containing 4 profiles.

Suppose the BCD bits are programmed as follows: Bit 2 = 0, Bit 1 = 1, Bit 0 = 0. This sequence of bits equals the number 2 and is the value of CVn OV. When the Enable discrete is triggered ON(1), the profiles in Program #2 will be loaded from internal memory into the function blocks for Profiles #1 through #4, where they can be edited or run.

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