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4.5 Error Indication Bit
This feature enables detection of communication breaks during error free communication between Gateway
and two devices. Communication breaks can occur due to no cable connection, wire faults, device power
failure at both ends of Gateway. An Error bit can be designated in each external device connected to
Gateway. Using this bit, fault at the PLC1 end can be reported to PLC2 Device and fault at PLC2 end can be
reported to PLC1 Device. When communication error occurs on PLC1, Gateway sets error bit in PLC2
device. Error Indication Bit can only be used in Master-Master mode. In Master-Slave mode any error can
easily be detected by a communication time out on the Master.
Error indication bit can be enabled using Gateway configuration software. Normally Error bit is disabled for a
New project. It can be enabled just by clicking on the check box in the setup software. Error indication bit
can be enabled in both or any one of the Devices connected to Gateway. Error Indication bit is “OFF” to
indicate error free communication. In case of communication error on PLC2, Gateway sets error bit on PLC1
port and vice versa.
4.6 Communication Parameters
Communication Parameters of Gateway can be set from configuration Software. This enables Gateway to
readily communicate with any device. Communication parameters for PLC1 and PLC2 ports can be
configured independently. This feature allows changes in Baud rate, Number. of stop bits, Parity etc. at any
time without downloading the driver for that particular device. After the driver for a particular device is
downloaded, the communication parameters can be changed simply by selecting new communication
parameters and downloading the same project.
4.6 Status LEDs
Gateway has 3 status LEDs located near PLC1 side. These LEDs indicate communication status and
Gateway operation. Three LEDs are identified as PLC1, OK and PLC2. PLC1 and PLC2 LEDs indicate
communication status on two ports whereas OK LED indicates the Gateway mode, either configuration or
operation.
PLC1 LED
Status
Description
Blinking Communication on PLC1 is OK.
Off No Communication on PLC1 due to
- Device fault.
- No power to Device.
- Cable fault.
- Wrong Communication Parameters.
OK LED
Status
Description
Off No power to Gateway.
Fast Blinking Gateway is waiting for IBM download.
Slow Blinking Communication error on PLC1 port. Error may be due to
- Device Fault.
- No power to either of the device.
- Cable fault.
- Wrong Communication Parameters.
Steady on Communication OK on PLC1 port.
PLC2 LED
Status
Description
Off No communication on PLC2.
Fast Blinking Communication with device on PLC2 is OK.
Slow blinking Gateway is trying to Communicate with the Device on PLC2, Device not responding due to
- Device has no power.
- Cable fault.
- Wrong Communication Parameters.