Add multiple I/Os to Can2Go SSL using Advantys OTB Modicon

[sesa194123_brid]

• Overview

Since MPM has limited build-in IOs,  and the TE2 is also limited in terms of I/Os, we will explore the possibilities of using Advantys OTB (Optimized Terminal Block) as the extension IO Module for Can2go/SSL controllers.

The Advantys supports several communication protocols (Modbus RTU, Modbus TCP and CANOpen ) with different Network Modules, however in this article, we will focus on Modbus TCP integration and we'll look at others later.

       

• Devices Used
  • SSL UN Controller
  • OTB 1E0DM9LP
  • 24 V DC Power supply

• Key Setup Steps
  • Setup the IP address of OTB (using DHCP)

              

                    *  for fix IP assignment, please refer to <<Advantys OTB User Manual.pdf>> for more details

• Write a Lua script to read the DIs of OTB and control the DOs

               create a AV1 and AV2 object

               AV1 --- use to store the DIs value

               AV2 --- use to control the DOs.

            Lua script

            ---------------------------------------------------------------------------------------------------

if init == nil then

  var("DI_status", "ME.AV1")

  var("DO_control", "ME.AV2")

  ipAddr = "192.168.1.100"

  port = 502

  --Advantys OTB DI use holding resiger with address 0

  DI_modbus_reg_addr = 0

  --Advantys OTB DO control use holding register with address 100

  DO_modbus_reg_addr = 100

  init = true

end

--Read DIs

--output: 

--   bit 1: DI1

--   bit 2: DI2

--   bit 3: DI3

--   bit N: DIN   (n = 1 .. 12)

function read_ios()

  code, value_table = modbus_tcp.hr_read(1, DI_modbus_reg_addr, 1)

  if code == 0 then

    --please note that the holder register in UN are using big-end

    --so we need to adapt it here

    raw_data= value_table[1]

    value = bit.rshift(raw_data,8) + bit.lshift(bit.band(raw_data,0xff),8)

    DI_status = value

    print( "DIs Status", DI_status);

  else

    print("read status failed, error code :" ,code)

    return 0

  end

end

--Write DOs

function write_ios()

  if DO_control == -1 then

    return

  end

  if DO_control < 0 or DO_control > 256 then

    print("illegal control value")

  end

  if DO_control ~= -1 then

    --please note that the holder register in UN are using big-end

    --so we need to adapt it here

    raw_value = bit.lshift(DO_control,8)

    print(raw_value)

    code, value_table = modbus_tcp.hr_write(1, 100, raw_value)

    if code == 0 then

      DO_control = -1

    else

      print("write control command failed, error code: " , code)

    end

  end

end

----main logic

modbus_tcp.close()

modbus_tcp.open(1, ipAddr , port)

read_ios()

write_ios()

modbus_tcp.close()

    -----------------------------------------------------------------------------------

• Test

         Give a first DI a 24V input, the AV1 value shall be 1  (could also monitor the stats in the Status indicator in OTB module)

         Set the AV2 to  1, the first DO will be activated.  (could also monitor the stats in the Status indicator in OTB module)

[LaurentCoene]

Another script from the SBS team on how to use this I/O extender:

https://documentation.smartstruxurelite.com/pages/viewpage.action?pageId=13828358