The SLC-500 is a very popular PLC with over a million installed processors in facilities around the world.
Over the years many of those facilities have modernized their sites by adding plantwide ethernet networks, and I often get calls asking how they can add their legacy SLC-500 systems to those Ethernet networks.
Note: For our previous articles on adding the Ethernet to the PLC-5 or MicroLogix, see the links below:
Native Ethernet with the SLC-5/05
If you're upgrading from a 5/01, 5/02, or 5/03 on which the DH-485 port is actively being used, you can add a 1761-NET-AIC and associated cable to the serial port of the SLC-5/05 in order to maintain DH-485 communications.
If you're upgrading from a SLC-5/03 or SLC-5/04 on which only the serial port is in use, you can use the serial port on the SLC-5/05 in it's place.
However, if your SLC-5/03 is using both ports, or your 5/04 is using it's DH+ port, the 5/05's single serial port won't be able to replicate those configurations, and you may want to consider one of the other options below.
Channel 0 Serial to Ethernet with the 1761-NET-ENI
While the ENI doesn't support the same number of “connections” and “packets per second” as the SLC-5/05, it's fairly simple to add and configure.
However, I would suggest comparing the ENI's price to the other options as its price has risen over the years.
DH-485 bridging to Ethernet with a Prosoft Gateway
The down side is, this device is in the end of its lifecycle and will only be available for a limited time.
DH+ bridging to Ethernet with a Prosoft Gateway
If you have a SLC-5/04 using channel 1, or a network of DH+ devices you want to bridge to Ethernet, the Prosoft AN-X2-AB-DHRIO gateway is a modern, easy to setup, bridge between DH+ and Ethernet which emulates a ControlLogix gateway.
Bridging a DH+ or DH-485 network to Ethernet with a ControlLogix Gateway
This solution consists of a 1756 power supply, chassis, Ethernet card, and either a 1756-DHRIO, or 1756-DH485 module with a 1761-NET-AIC.
Prosoft 1746 Ethernet Module
This single slot 1746 module uses M files and ladder logic to act as either an Ethernet messaging server or client.
This module also has an “Ethernet to Serial” pass-through capability which acts much like the 1761-NET-ENI, and allows remote monitoring and editing of the SLC-500 using RSLogix 500.
I hope the above information about adding Ethernet to a SLC-500 is helpful. If you have any comments, questions, suggestions or corrections, please leave them with us by using the “post a comment or question” link below
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- Good day Shawn.
We are replacing a PLC5/40E with BASIC card to a serial printer, RIO modules for IO, and a DH+ HMI, and Ethernet for data collection, with a SLC system.
I wanted to use a SLC-5/05 to get Ethernet, but would lose the HMI connection, and cannot find a reasonably priced Ethernet to DH+ solution.
To maintain the existing HMI, I can use a 5/04 - giving me its serial port for the printer, and its DH+ for the HMI - add a RIO scanner card, for the IO. But now I lose the data collection requirement. Unfortunately, since its RS232 port is going to be used for the printer, a NET-ENI is not an option.
Any ideas?Good morning ,
Sounds like you need RS232 Serial for the Printer, Ethernet for data, and DH+ for the HMI, but as you said an SLC doesn't come with all three, and the ENI is out because you have to have the serial port 🙁
- Question: Does the HMI have another communications port?
Many people have PVPlus HMI's and don't realize how easy it is to change them from DH+ to Ethernet or DF1. However if you have a legacy HMI with only DH+ you'll likely need to stay with the 5/04 unless you have the budget to update it to a PVPlus 7 (there are some lower cost options which allow you to import legacy PV projects.)
- DH+ to Ethernet options
There are quite a few options in this area under $2K including the Prosoft and Automation Networks. While these may seem pricey, the could be less expensive then upgrading an HMI, writing Basic code, or even buying the now expensive ENIs:
Finally, you could use the old ENI on the serial port and use a 1746-BAS module with similar code that you had in your 1771-BAS module. As far as strict 1746 ASCII modules it looks like the ones I'm familiar with are obsolete.
I also haven't tried a SLC Ethernet MSG to ASCII output device, but you may want to check out this article to see if the device he used would work with a SLC:
Another option may be to use a 1747-DPS1 Port Splitter Port splitter on a SLC-5/05 channel 0 with ASCII on one port and the ENI on the other. Check out the information below to see if it would work in your app:
Hope this helps!
Shawn Tierney, The Automation Blog