Applies To:
  • CitectSCADA 1.00, 1.01, 1.10, 1.11, 1.20, 2.00, 2.01
Summary:
Question: I am getting the runtime error 'ReQSize too big 130' on the I/O Server. What causes this error? 

Solution:
This error is generated when a request to a protocol driver is bigger than the maximum size it can read. This may occur if you have definded an array that is too big, or specified the unitCount too big in the function PointNew(). The maximum read size is documented in the online help of the protocols driver.

This error is logged to the SYSLOG.DAT along with the protocol address that caused the error. Look in the SYSLOG.DAT file to find the particular address that is causing the problem. For example:

READ 0000 port1 U150 V1200 130
Thu Feb 24 14:41:20 1994 File (plc_drv.c) Line (1526) Error ReQSize Too big 130

This error shows that a read request on unit U150, address V1200 with a length of 130 caused the problem. Find this address in your project to fix the problem. 
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