9.381 Moxa-ioLogik-Current

The Moxa-ioLogik-Current logical device converts the binary current value read from a Moxa M-3802 I/O module in an ioLogik 4000 or 4200 controller to a readable current reading.

The M-3801 module marks invalid measurements (broken cable) with the special value '0x8000'. The Moxa-ioLogik-Current device detects this value and raises a fault in this case. The current value shown in case of this fault is '0.0 mA'.

Device window pages

The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .

• --- Shows the actual current value
• --- The device info page.
• --- The maintenance page. The configuration parameters from this page are described below.

Configuration parameters

At the maintenance page of the device window the parameter ID of the Moxa ioLogik device must be set which holds the binary current value.

Module addresses with Moxa ioLogik 4000

The Moxa ioLogik 4000 I/O controllers dynamically assign the Modbus addresses for the connected modules, starting at 0 with the first module mounted nearest at the base module. Modbus registers are 16 bit wide, but because many I/O modules require only 8 or 4 bit, the ioLogik 4000 manages Modbus addresses in steps of 8 bit (half 16-bit registers). Hence, it can happen, that the current register of a M-3801 module may be split over two modbus registers.

To deal with this, the Moxa-ioLogik-4000 driver provides beside the "I????" variables which each hold the contents of one Modbus register a second set of variables called "J0000" to "J001E". These contain 16 bit values with 8-bit address shift. The "J????" variables may be used to read current values which are split across two Modbus addresses.

If e.g. the ioLogik Web GUI states, that the current register of your interest is at "0012", simply use the "I0012" variable in "currentId". If the ioLogik Web GUI states, that the current register is at "0012+08", use the "J0012" variable instead.

Module addresses with Moxa ioLogik 4200

The Moxa ioLogik 4200 I/O controller uses a different, static Modbus addressing scheme, however the sat-nms driver for this controller dynamically assigns analog readings to the parameter A0000 to A000F. A0000 contains the first channel of the first M-3802 module (that one next to the main module). A0001 contains the second channel of this module, A0007 the 8th channel of this module and so on. The sat-nms Moxa-ioLogik-4200 device driver supports up to 16 analog readings from various analog input modules. As the M-3802 module has 8 channels, up to two of these modules are supported in one device.

Variables defined by this device driver