Hazardous Area Remote I/O
Elantas Beck modernizes 19” interface cards with the compact remote I/O system, excom, from Turck
After many years of use, the 19” interface cards became susceptible to defects. Since new cards were more and more difficult to obtain, an alternative was sought out. The decision was made to modernize the interface technology for one reactor line first and use the still intact cards as spare parts for the other reactor lines.
Fieldbus instead of 19“ cards
Thomas Pölking, head of maintenance, chose from different alternatives and decided on a fieldbus solution in the end. “We wanted an easy and modern solution, with integrated Ex-separation and easy, direct connection to our S7-PLC,” Pölking explains. “Before the modification, the connection worked only indirectly.”
After the fundamental decision for a remote I/O system was made in the summer of 2008, the search for a qualified provider began. EAB Automation, a company that specializes on modernizations, extensions and new constructions of procedural and manufacturing automation plants, was retained to aid in the search.
Assembly in 19” rack
Within the search for a remote I/O system provider, EAB compared solutions from different manufacturers before the decision was made in favor of the excom remote I/O system from Turck. "With the excom system from Turck, we found a remote I/O solution that is really easy to handle and so compact that we could install it into the already existing 19” racks, together with all 150 I/Os,” Jochen Ahrend, manager of EAB Automation, says. The excom systems fulfills another requirement of Elantas, because the additional PLC for the reactor line is no longer necessary. “Now the signals are sent to the excom system from Turck and then directly to the S7, so we can save a detour over another control,” Pölking states.
Even though this was the first project where EAB implemented excom, the plan was as successful as the realization. In the fall of 2008, employees were able to install and start the system over the course of only one weekend, so the plant was fully operational again on Monday morning. “We had no experience with the product then, insofar the support from Turck helped a lot,” Ahrend explains. “Even the description was particularly good, and all our additional questions were answered by the specialists from Turck quickly so we could continue on our project successfully.”
Flexible system
Even though the remote-I/O system wasn't installed in a hazardous area for this project, it is possible to install excom in zones 1 and 2. The field circuits are approved for the use up to zone 0. The IP20 rated I/O modules offer four analog or four to eight binary inputs or outputs at a width of 18.2 mm. Two redundant power supplies, two redundant gateways and up to 16 E/A-modules can be installed on an area of 43.2 cm by 20.6 cm by 11 cm. In this configuration, up to 128 binary or 64 analog channels are available in a very small space.
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