WAGO 750-655 User manual

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Using the WAGO 750-655 AS-i Module with the SMLC

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Introduction
The AS-interface master module 750-655 is
used to integrate the AS-interface network into
the WAGO-I/O-SYSTEM 750.
The AS-interface master module 750-655
behaves as a master for the AS-interface and as
a slave for the field bus. It complies with the
new AS-interface specification 2.1. This means
that:
• up to 62 AS-interface slaves can be connected
to the master
• the transmission of analog values is integrated
within the masters
• all other functions of the new specification,
such as the evaluation of peripheral errors, are
also implemented
The SMLC’s PLC Configuration supports using
the 750-655 with any of the 750 Series Ethernet
bus couplers.

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From the WAGO manual
for the 750-655.
Up to three 750-655
modules can be
connected to one bus
coupler.
IMPORTANT: You
must have SMLC
firmware version 2.4.2
or later to use the 750-
655 module!

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The 750-655 can be
configured in several
different operating modes.
In each of these modes
various process image
sizes can be selected,
allowing access to
increasing numbers of
AS-i slaves.
The SMLC requires that
the 750-655 be configured
in operating Mode 1 -
permanently configured
mailbox.
The SMLC requires the use of Mode 1

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While the 750-655 can be configured for
many different process image sizes the
SMLC supports a limited number of these.
In the SMLC’s PLC Configuration you can
select from the following Mode 1 possible
configurations:
24 byte process image, 6 byte mailbox
12 byte process image, 6 byte mailbox
12 byte process image, 0 byte mailbox
40 byte process image, 0 byte mailbox
48 byte process image, 12 byte mailbox
The 0 byte mailbox configurations only
support digital slaves. If you intend to use
analog slaves you need to select a
configuration with a non-zero length
mailbox.
The table at the right shows all of the
possible Mode 1 configurations. The SMLC
only supports those listed above!

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In order to decide which configuration you should insert into the SMLC’s PLC Configuration consider how many
slave devices you intend to use and whether they are all digital or if you will have some analog devices.
If you are going to use analog device you must use one of the configuration that supports the mailbox.
If you are going to use all digital devices you can pick one of the configurations with a 0 byte mailbox. The
advantage of the 0 byte mailbox is that the AS-i module will take up less memory in the bus coupler’s process
image, allowing you to install more I/O modules. Remember that the bus coupler is limited to 255 bytes of
inputs and 255 bytes of outputs and a maximum of 64 modules.
For example: if you know that you will have less then 20 digital AS-i devices and no analog devices then
selecting the 12 byte process image with a 0 byte mailbox is sufficient.
The table below shows how many slave devices can be supported for a given configuration. 7A indicates 7 slaves
on the A bus. 31A/31B indicates 31 slaves on the A bus and 31 slaves on the B bus, etc.

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In order to configure the 750-655 AS-i module and to assign the slave device IDs you need to use
the WAGO I/O Check software (759-302). Connect the WAGO programming cable (750-920) to the
bus coupler and to a free serial port on your computer.
NOTE: If the Ethernet cable is plugged into the bus coupler, unplug it. WAGO I/O Check will not allow
you to configure the bus coupler while the fieldbus is active!

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Start WAGO-I/O-Check configure the I/O Check COM port using the Settings menu.
In this example the cable is connected to COM2.

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Start WAGO-I/O-Check and click on the Node Configuration icon to read the current configuration. In
this example we only have the 750-655 AS-i module and a 750-600 end module connected to a 750-342.

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Click on the Settings button to configure the process image and mailbox size. The default settings are
24 byte process image and 6 byte fixed mailbox. The SMLC supports this configuration and this selection
allows you to access up to 31 AS-i slaves.
The SMLC does not support the Overlapped Mailbox so do not check this.
If you change any of the settings click the Apply button to send the new configuration to the bus coupler.