While the AS-International Association’s(www.as-interface.net)AS-I appeared about 15 years ago, CompoNet, from the Open DeviceNet Vendors Association(ODVA, www.odva.org)，于2006年10月到达。都提供高速通信。两者还提供一定程度的安全功能和/或连接性。工作系统的AS-I安全是一个例子。
Both open networks use the master/slave communications scheme. With vendor-topology-independent AS-I, “that means a component—in our case, either a scanner or gateway—is the originator [master] of all conversations,” says Helge Hornis, manager of intelligent systems for Pepperl+Fuchs Inc. (www.pepperl-fuchs.com), a Twinsburg, Ohio, automation components supplier. The master calls or polls a slave, which is the input/output (I/O) node, and then sends the output, or the message; the slave must then reply.
Hornis says end-users have a larger number of smaller nodes in these systems. That means less cabling, thus less capital expense and fewer potential errors. He notes the system uses AS-I’s yellow flat cable, which carries both power and data, rather than traditional two-wire cabling.
为了构建一个系统，技术人员沿I/O的路径铺设了电缆，然后将每个电缆与AS-I的快速穿孔技术连接器连接起来。接下来，将扫描仪卡或网关安装到控制器中，并将网络插入并配置。霍尼斯解释说：“设置网络后，您可以简单地连接到电缆沿任何地方的电缆。”
At the network’s upper limit of 62 slaves, Hornis says, “you end up with update time for the entire system of 10 milliseconds.” That update time applies even if there are four inputs at each I/O node or slave, he adds. “But if we then double the number of inputs per module [to eight per node], then the update time goes up to 20 milliseconds.”
Latest entry
Managed and licensed by ODVA, but created by Omron (www.omron.com), the Japan-based automation products vendor, CompoNet offers more speed than AS-I. It has the capability of 1-millisecond messaging in a 1,024-I/O-point system, asserts Jeff Jurs, manager of business development for Omron Electronics LLC, in Schaumburg, Ill. Designed to handle a 4-megabit-per-second (Mbps) backbone network, the bus also allows three other baud rates: 3 Mbps, 1.5 Mbps and 93.75 kilobits per second, or Kbps. “The differences allow maximum flexibility in topology,” Jurs comments.
At the upper end of the speed range, end-users may use a cable of 30 meters into which nodes can be connected. But at the low end of the range, cabling can be much longer, and “there are almost no rules on how you can configure the network,” says Jurs. For example, for materials handling, a low-end application, “if you need additional sensors, you can tap into the net using clamp-on nodes. You’re free to put on drops wherever you’d like,” Jurs remarks.
In point-to-point connections with CompoNet, the net works with a simple, low-cost, two-wire unshielded cable, he adds. “But you can also buy a four-wire industrial cable, a ribbon cable.” And repeaters used with the net “are actually nodes with some intelligence added to them,” Jurs adds. “The first segment is local, where the master is. But you can go up through two repeaters to give three segments.”
Because communications in an enterprise extend beyond sensors and actuators, one important feature both bit-level buses possess is connectivity to industrial networks. For example, CompoNet can access ODVA’s Common Industrial Protocol, or CIP, Network Library. That includes, among others, EtherNet/IP, DeviceNet and ControlNet. AS-I is compatible with ProfiBus, EtherNet/IP and industrial Ethernet, for example.
C. Kenna Amos，ckamosjr@earthlink.net，是一个自动化世界的编辑。
Both open networks use the master/slave communications scheme. With vendor-topology-independent AS-I, “that means a component—in our case, either a scanner or gateway—is the originator [master] of all conversations,” says Helge Hornis, manager of intelligent systems for Pepperl+Fuchs Inc. (www.pepperl-fuchs.com), a Twinsburg, Ohio, automation components supplier. The master calls or polls a slave, which is the input/output (I/O) node, and then sends the output, or the message; the slave must then reply.
Hornis says end-users have a larger number of smaller nodes in these systems. That means less cabling, thus less capital expense and fewer potential errors. He notes the system uses AS-I’s yellow flat cable, which carries both power and data, rather than traditional two-wire cabling.
为了构建一个系统，技术人员沿I/O的路径铺设了电缆，然后将每个电缆与AS-I的快速穿孔技术连接器连接起来。接下来，将扫描仪卡或网关安装到控制器中，并将网络插入并配置。霍尼斯解释说：“设置网络后，您可以简单地连接到电缆沿任何地方的电缆。”
At the network’s upper limit of 62 slaves, Hornis says, “you end up with update time for the entire system of 10 milliseconds.” That update time applies even if there are four inputs at each I/O node or slave, he adds. “But if we then double the number of inputs per module [to eight per node], then the update time goes up to 20 milliseconds.”
Latest entry
Managed and licensed by ODVA, but created by Omron (www.omron.com), the Japan-based automation products vendor, CompoNet offers more speed than AS-I. It has the capability of 1-millisecond messaging in a 1,024-I/O-point system, asserts Jeff Jurs, manager of business development for Omron Electronics LLC, in Schaumburg, Ill. Designed to handle a 4-megabit-per-second (Mbps) backbone network, the bus also allows three other baud rates: 3 Mbps, 1.5 Mbps and 93.75 kilobits per second, or Kbps. “The differences allow maximum flexibility in topology,” Jurs comments.
At the upper end of the speed range, end-users may use a cable of 30 meters into which nodes can be connected. But at the low end of the range, cabling can be much longer, and “there are almost no rules on how you can configure the network,” says Jurs. For example, for materials handling, a low-end application, “if you need additional sensors, you can tap into the net using clamp-on nodes. You’re free to put on drops wherever you’d like,” Jurs remarks.
In point-to-point connections with CompoNet, the net works with a simple, low-cost, two-wire unshielded cable, he adds. “But you can also buy a four-wire industrial cable, a ribbon cable.” And repeaters used with the net “are actually nodes with some intelligence added to them,” Jurs adds. “The first segment is local, where the master is. But you can go up through two repeaters to give three segments.”
Because communications in an enterprise extend beyond sensors and actuators, one important feature both bit-level buses possess is connectivity to industrial networks. For example, CompoNet can access ODVA’s Common Industrial Protocol, or CIP, Network Library. That includes, among others, EtherNet/IP, DeviceNet and ControlNet. AS-I is compatible with ProfiBus, EtherNet/IP and industrial Ethernet, for example.
C. Kenna Amos，ckamosjr@earthlink.net，是一个自动化世界的编辑。
![Mps035 Sm 1200x628 D[2]](https://img.automationworld.com/files/base/pmmi/all/image/2021/03/MPS035_SM_1200x628_D_2_.604a4a336bc60.png?auto=format%2Ccompress&bg=fff&fill-color=fff&fit=fill&h=146&pad=5&q=70&w=340)
