Class: PlcUtil::Awl::DbAddress

Inherits:
Object
  • Object
show all
Defined in:
lib/plcutil/siemens/awl/db_address.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bit_addr, data_block_addr = nil) ⇒ DbAddress

Returns a new instance of DbAddress.



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 6

def initialize(bit_addr, data_block_addr = nil)
	@bit_addr, @data_block_addr = bit_addr, data_block_addr
end

Instance Attribute Details

#data_block_addr ⇒ Object

Returns the value of attribute data_block_addr.



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 4

def data_block_addr
  @data_block_addr
end

Instance Method Details

#bit ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 14

def bit
  @bit_addr % 8
end

#byte ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 18

def byte
  @bit_addr / 8
end

#next_byte ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 32

def next_byte
  DbAddress.new(next_n(8), data_block_addr)
end

#next_word ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 22

def next_word
  # simatic packing rules
  # 1. 16 bit values aligned at modulo 2 address 0.0, 2.0, 4.0, 8.0, ...
  # 2. 8 bit values aligned at each address, 0.0, 1.0, 2.0, ...
  # 3. Structs are aligned modulo 2
  # 4. Bools are aligned like 8 bit values, consecutive bools occupy a single byte

  DbAddress.new(next_n(16), data_block_addr)
end

#skip(bit_count) ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 47

def skip(bit_count)
  DbAddress.new @bit_addr + bit_count, data_block_addr
end

#to_s ⇒ Object 



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# File 'lib/plcutil/siemens/awl/db_address.rb', line 10

def to_s
	(data_block_addr || 'DB???') + ',' + byte.to_s + '.' + bit.to_s
end