Serial I/O-Bus¶
The synchronized serial I/O bus is the I/O data bus for the I/O expansion modules and connects the I/O expansion modules with the Processor Modules or Communication Interface Modules. Through this bus, I/O and diagnosis data are transferred.
Up to 10 I/O Terminal Units (for 1 I/O expansion module each) can be added to one Terminal Base. The I/O Terminal Units have a bus input at the left side and a bus output at the right side. Thus the length of the I/O bus increases with the number of the I/O expansion modules used.
The electrical connection of the I/O bus is performed automatically by telescoping the modules on the DIN rail. The I/O bus provides the following signals:
- Supply voltage of 3.3 V DC for feeding the electronic interface components
- 3 data lines for the synchronized serial data exchange
- several control signals
Attention
The I/O bus is not designed for plugging and unplugging modules while in operation. If a module is plugged or replaced while the bus is in operation, the following consequences are possible
- reset of the station or of the CPU
- system lockup
Warning
:strong:Removal/Insertion under power
The devices are not designed for removal or insertion under power. Because of unforeseeable consequences, it is not allowed to plug or unplug devices with the power being ON.
Make sure that all voltage sources (supply and process voltage) are switched off before you are
- connecting or disconnecting any signal or terminal block
- removing, mounting or replacing a module.
Disconnecting any powered devices while energized in a hazardous location could result in an electrical arc, which could create a flammable ignition resulting in fire or explosion.
Be sure that power is removed and that an area has been thoroughly checked to insure that flammable materials are not present prior to proceeding.
The devices must not be opened when in operation. The same applies to the networking interfaces.
With its fast data transmission, the I/O bus obtains very low reaction times. Depending on the device and on the version of firmware and Automation Builder, the following numbers of I/O devices can be connected to the I/O bus.
| Device | Version Control Builder/Automation Builder | Version Firmware | Max. Number of I/O Devices |
|---|---|---|---|
| AC500-eCo PM55x and PM56x (-ETH variants only) | as of V2.0.0 | as of V2.0.0 | 7 |
| AC500-eCo PM55x and PM56x | as of V2.1.0 | as of V2.0.6 | 10 |
| CS31 bus Modules DC551-CS31 and CI592-CS31-HA | all | all | 7 |
| FBP Interface Module DC505-FBP | all | all | 7 |
| CANopen® Bus Modules CI581-CN and CI582-CN | as of V2.1.0 | all | 10 |
| PROFIBUS® Bus Modules CI541-DP and CI542-DP | as of V2.1.0 | all | 10 |
| PROFINET® Bus Modules CI504-PNIO and CI506-PNIO | as of V2.1.0 | all | 10 |
| EtherCAT® Communication interface module CI511-ETHCAT and CI512-ETHCAT | As of AB V1.1 | As of FW Version V2.0.x | 10 |
General data:
¹) Minimum bus cycle time: This value is valid for all module combinations (from 1 to 10 expansion modules)
Wiring (bus connection):