Can an alarm still be displayed on the DCS when the pressure signal is fed to the ESD for interlock purposes?

Through ESD to DCS communication

The more economical option is to use a signal distributor; the cost of communicating with ESD and DCS is quite high!

Well, our factory’s systems are likely for communication purposes. Previously, the manufacturers took care of everything; but what if we need to add another interlock point that needs to be displayed on the DCS? Do we still have to turn to the manufacturer? Don’t understand communication

Signal distributors add failure points to the ESD system; moreover, they likely have not passed TUV certification, which reduces the reliability of the safety system, so their use is not recommended. You can ask the manufacturer whether spare points are available; generally, project construction requires a certain number of communication spare points to be provided.

It is recommended to use communication to send the ESD signals to the DCS for display; if your DCS system has communication capabilities, it should not incur any additional costs.

It mainly depends on the system requirements; if communication devices need to be added, that will increase costs. But if the two systems are already able to communicate with each other, then good communication is achieved. If the communication isn’t sufficient, using a signal distributor is also an option. The key is to choose a high-quality distributor, as after all, the signals that reach the ESD are those involved in the parking process, and it’s important not to disrupt normal control functions! A few suggestions; act as appropriate~

It’s very simple: use a two-input one-output safety barrier, with the pressure signal fed into the barrier and then two outputs – one for the DCS and one for ESD

It is possible, through ESD and DCS communication.

1. Install a transmitter on-site. 2. Replace the existing transmitter with one that provides multiple outputs or is part of a field bus system, so that additional outputs can be sent to the DCS. 3. Add safety barriers or use hardwired connections in the IO junction box or IO cabinet to create redundant channels for sending data to the DCS. 4. Use OPC between the DCS and the ESD system for data transmission

1: First, check that there is communication from ESD to DCS; this can be found on the DCS. 2: An output can be created on the ESD, and an input on the DCS; this is called a hardwired connection.

1. A one-in-two-out safety barrier is essentially a safety barrier with signal distribution capabilities – it requires minimal investment. 2. Configure communication between DCS and ESD – if communication between DCS and ESD has not been set up previously, the investment required is high. 3. If the communication is deemed unreliable, a hardwired connection can be established through the I/O card interfaces of DCS and ESD – the investment required is minimal. This post was last edited by hwindforce on 2009-2-17 at 15:46.]

If a large number of points are required, it is more appropriate to use ESD communication for DCS, as the cost of additional communication modules is relatively high, while the average cost remains low. If the number of points is low, providing a signal distributor is a good solution

It is transmitted via ESD to the DCS; a DO point is output from ESD to the DCS, and a signal is sent to the DCS before it reaches ESD

There are 2 options: 1. The safety barrier can be a dual-output type, with one output for ESD and another for DCS； 2. Communicate with the DCS via serial communication. It is recommended to use communication methods, as there are usually other signals that need to be monitored as well; it’s not possible to switch everything to dual output. Once communication is established, those other signals can be monitored according to your needs.

1 Because modern ESD and DCS systems support various buses, such as the Modbus bus. Moreover, the implementation cost is very low – only one additional cable is needed; these cables are usually located in cabinet rooms, where the distance between them is not very great (if the cabinet rooms are located on-site and are far apart from each other, then the relationship between speed and distance must be taken into consideration). After that, the DCS software simply needs to be modified and installed. 2 Generally, such ESD signals fed into the DCS are only provided for reference by operators; in case of an emergency, the ESD signals should still take precedence. Usually, there are no problems. Many designs explicitly require communication between ESD and DCS (unidirectional from ESD to DCS). 3 In cases where all systems have already been installed, it is not recommended to use signal distributors, as it poses potential risks.

I agree with what was said above. That’s how we use it.