Class: Simatic::Sessions::WriteSession

Inherits:
ExchangeSession show all
Defined in:
lib/simatic/sessions/write_session.rb

Overview

Write communication session

Instance Method Summary collapse

Methods inherited from Session

#packet_number

Instance Method Details

#make_request(memory_mappers) ⇒ Object 



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# File 'lib/simatic/sessions/write_session.rb', line 8

def make_request memory_mappers
  @memory_mappers = memory_mappers

  param = [ FuncWrite, # 8bit function
            @memory_mappers.count, # count of read-requests
          ].pack('C2')

  data = ''

  @memory_mappers.each do |memory_mapper|
    param += write_request_param memory_mapper
    data += write_request_data memory_mapper
  end


  super param, data
end

#parse_response(raw_data) ⇒ Object 



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# File 'lib/simatic/sessions/write_session.rb', line 26

def parse_response raw_data
  super raw_data

  unless FuncWrite == @function
    raise "unknown function 0x#{@function.to_s(16)} in #{self.class} response"
  end

  result_code = @data[0,1].unpack('C').first

  case result_code
  when 0xff
    result_code
  when 0x0A
    raise "Item not available, code #{result_code}" # for s7 300
  when 0x03
    raise "Item not available, code #{result_code}" # for s7 200
  when 0x05
    raise "Address out of range, code #{result_code}"
  when 0x07
    raise "Write data size mismatch, code #{result_code}"
  else
    raise "Unknown error, code #{result_code}"
  end
end