The IO link master module "4SI IO link" for the ET 200S distributed I/O system is included in the first version delivered in accordance with IOL standard V1.0. Up to four IO link devices (sensors and actuators) can be connected to the IO link master module.
The Port Configuration Tool (S7-PCT) is used to parameterize the IO link master module "4SI IO-Link" and the IO link devices. The S7-PCT is available to download in the following entry: 32469496.
Fig. 01: IO link system
If a device becomes defective and has to be replaced with a new one, the new device had to be reparameterized since new devices generally come with factory settings. If the function for reparameterizing replaced components is implemented in the system, the startup data which is saved in the host is sent to the lower-level components. This represents a system solution for replacing devices without having to connect the programming device (PG).
The reparameterization of replaced components is not implemented in the first version of the IO link system delivered; i.e. even though the IO link master parameters are saved on the IO link master module, replacing the IO link master module would necessitate reparameterization by means of S7-PCT. If an IO link device is replaced, there is also a need for reparameterization by means of S7-PCT because the IO link device parameters are only saved in the actual IO link device.
(Parameter) data is written to an IO link device or read from an IO link device with FB1, "IOL_CALL". The data is assigned a unique address on the IO link device with an index and subindex.
FB1 "IOL_CALL" and a description of FB1 "IOL_CALL" are available to download in the following entry: 32011237.
The block provides support with the following tasks:
- (Re)parameterizing an IO link device during operation
- Executing IO link port functions
- Saving / Backing up IO link device parameters
- Saving / Backing up IO link master parameters
Fig. 02: FB1 "IOL_CALL"
Using FB1 "IOL_CALL" to replace an IO link master and an IO link device without a PG
FB1 "IO_CALL" can be used to read any data objects from IO link devices, to save these objects so that they are powerfail-proof and to write to an IO link device again after replacing it by means of the FB1 "IO_CALL". The FB1 "IOL_CALL" and the retentive saving process must be controlled by the user program, e.g. by triggering the mechanism via a binary switch.
Since every IO link device contains other data objects, there can only be one user-specific solution in which the IO link device parameters have to be saved and backed up.
A special function of FB1 "IOL_CALL" can be used to save and back up the master parameters. If the input parameters "IOL_INDEX" and "IOL_SUBINDEX" are preconfigured with "0", the IO link master parameters are handled.